CN114706868A - Surveying and mapping data acquisition system and method based on geospatial information data surveying and mapping - Google Patents
Surveying and mapping data acquisition system and method based on geospatial information data surveying and mapping Download PDFInfo
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Abstract
The invention provides a surveying and mapping data acquisition system and method based on geospatial information data surveying and mapping. The mapping data acquisition method comprises the following steps: extracting historical data of geographic space information corresponding to a target area in a geographic information system, and setting an image acquisition time interval according to the historical data; acquiring an image of the environment information of the target area according to the image acquisition time interval to obtain an environment image of the target area; performing region segmentation on the environment image of the target region to obtain a plurality of region images; extracting geographic space information corresponding to the area image from a geographic information system corresponding to the target area according to the area image; and analyzing the area image and the geographic spatial information corresponding to the area image respectively to determine whether to update the mapping data. The system comprises modules corresponding to the method steps.
Description
Technical Field
The invention provides a surveying and mapping data acquisition system and method based on geospatial information data surveying and mapping, and belongs to the technical field of geographic information measurement.
Background
Geographic Information Systems (GIS) are sometimes also referred to as "Geographic Information systems". It is a specific and very important spatial information system. The system is a technical system for collecting, storing, managing, operating, analyzing, displaying and describing relevant geographic distribution data in the whole or partial earth surface (including the atmosphere) space under the support of a computer hardware and software system. However, in the existing geographic information system, because the geospatial data is acquired at a fixed uniform time interval and the mapping data is updated through data analysis, the problem that the mapping data is not updated timely due to long time is caused.
Disclosure of Invention
The invention provides a surveying and mapping data acquisition system and method based on geospatial information data surveying and mapping, which are used for solving the problem that the timeliness of data acquisition and tracking of the existing geographic information system is poor, so that the surveying and mapping data is not updated timely, and adopt the following technical scheme:
a survey data acquisition method based on geospatial information data surveying, the survey data acquisition method comprising:
extracting historical data of geographic space information corresponding to a target area in a geographic information system, and setting an image acquisition time interval according to the historical data;
acquiring an image of the environment information of the target area according to the image acquisition time interval to obtain an environment image of the target area;
performing region segmentation on the environment image of the target region to obtain a plurality of region images;
extracting geographic space information corresponding to the area image from a geographic information system corresponding to the target area according to the area image;
and analyzing the area image and the geographic space information corresponding to the area image respectively to determine whether to update the mapping data.
Further, extracting historical data of the geospatial information corresponding to the target area in a geographic information system, and setting an image acquisition time interval according to the historical data, wherein the image acquisition time interval comprises the following steps:
setting a plurality of elevation observation sites in the target area; the elevation value observation site is set according to the actual condition and the topographic characteristics of the target area, and the set standard is a position point with prominent elevation change characteristics in the target area;
extracting historical data of geospatial information corresponding to a target area in a geographic information system, and acquiring an updating time point of each data updating and a digital elevation value corresponding to the elevation value observation point during each data updating from the historical data; wherein the historical data comprises an update time point of each mapping data update, data update content, a data acquisition time interval for a target area in a geographic information system and elevation value data acquired each time;
acquiring a digital elevation value difference value corresponding to the elevation value observation site before and after each data update according to a digital elevation value corresponding to the elevation value observation site during each data update;
respectively judging whether the digital elevation difference value corresponding to each elevation observation site exceeds a preset first difference value threshold value; when the number of the elevation observation points corresponding to the digital elevation difference exceeding the preset first difference threshold meets a preset number condition, marking the data updating time point; wherein the preset quantity condition is as follows:
H≥INT(0.38×Hz)
wherein H represents the number of elevation observation sites corresponding to the digital elevation difference exceeding the preset first difference threshold; hzRepresenting the total number of the observation sites with the elevation values; INT () means round up;
and acquiring an image acquisition time interval according to the updating time point of each data updating and the updating time point with the mark. Wherein the image acquisition time interval is obtained by the following formula:
wherein T represents an image acquisition time interval; m represents the number of the update time points with marks; n represents the total number of the update time points of the geographic information system data update; t is a unit ofiIndicating the time between the ith data update and the last data updateA length; t isjRepresenting the time interval between the jth marked updating time point and the last marked updating time point; t is0Representing a data acquisition time interval for a target area within a geographic information system; ciThe number of data acquisition time intervals for the target area in the geographic information system, which is passed by the mapping data update of the ith geographic information system, is represented; w0Representing an elevation value numerical value corresponding to a preset first difference threshold; wpRepresenting the average value of the digital elevation difference values of all the elevation observation points exceeding a preset first difference value threshold value when the mapping data of the geographic information system is updated each time; w represents the total variation of the digital elevation value corresponding to the elevation value observation point of the most original geographic space data relative to the target area when the geographic information system updates the mapping data last time.
Further, performing region segmentation on the environment image of the target region to obtain a plurality of region images, including:
acquiring the position of each elevation value observation site;
acquiring a linear distance value between two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point;
acquiring an area radius according to a linear distance value between the two elevation observation points which are closest to each elevation observation point and each elevation observation point, wherein the area radius is as follows:
wherein R represents a region radius; r1Representing a linear distance value between one elevation value observation site with a closer distance of the two elevation value observation sites with the closest distance to each elevation value observation site; r2Representing that one elevation observation site far away from the two elevation observation sites closest to the two elevation observation sites arrives at each stationAnd linear distance values among the elevation value observation points are described.
Taking each elevation value observation point as a circle center, and taking the area radius as a radius to obtain a plurality of area ranges;
and acquiring the area image corresponding to each area range according to the area ranges.
Further, analyzing the area image and the geospatial information corresponding to the area image respectively to determine whether to update the mapping data, including:
extracting area geographic space information corresponding to the area position according to the area position corresponding to the area image, and determining whether to update mapping data according to an elevation value judgment rule according to an elevation value data point and an elevation value observation point which are arranged in the geographic information system and are positioned in the area geographic space information corresponding to the area position;
and extracting the road condition change rate in the area images according to the area positions corresponding to the area images, and updating the mapping data of the target area when the road condition change rate corresponding to two or more area images exceeds a preset road change rate threshold value.
Further, the elevation value determination rule includes:
updating the mapping data of the target area when the difference value of the elevation value of any one of the elevation value observation points in the area geospatial information corresponding to the area position relative to the elevation value updated by the mapping data at the last time exceeds a preset second difference value threshold;
when the difference value of the elevation value observation site in the area geospatial information corresponding to the area position relative to the elevation value updated by the last mapping data does not exceed a preset second difference value threshold value, extracting the current elevation value of the existing elevation value data point in the area geospatial information corresponding to the area position and the current elevation value of the elevation value observation site, wherein the current elevation value is set in the geographic information system; setting an updated elevation value of the last mapping data of an elevation value data point in the geographical space information of the area corresponding to the area position and an updated elevation value of the last mapping data of the elevation value observation site in the geographical information system, and acquiring an elevation value difference value corresponding to the elevation value data point and an elevation value difference value corresponding to the elevation value observation site; and updating the mapping data of the target area when any one of the absolute value sum of the difference of the elevation values corresponding to the elevation value data points and the absolute value sum of the difference of the elevation values corresponding to the elevation value observation points exceeds a preset sum threshold.
A survey data acquisition system based on geospatial information data surveying, the survey data acquisition system comprising:
the acquisition time interval setting module is used for extracting historical data of the geographic spatial information corresponding to the target area in the geographic information system and setting an image acquisition time interval according to the historical data;
the image acquisition module is used for acquiring images of the environmental information of the target area according to the image acquisition time interval and acquiring an environmental image of the target area;
the region dividing module is used for performing region segmentation on the environment image of the target region to obtain a plurality of region images;
the extraction module is used for extracting the geographic space information corresponding to the area image from the geographic information system corresponding to the target area according to the area image;
and the analysis module is used for analyzing the area image and the geographic spatial information corresponding to the area image respectively and determining whether to update the mapping data.
Further, the acquisition time interval setting module includes:
the setting module is used for setting a plurality of elevation value observation sites in the target area; the elevation value observation site is set according to the actual condition and the topographic characteristics of the target area, and the set standard is a position point with prominent elevation change characteristics in the target area;
the historical data extraction module is used for extracting historical data of the geospatial information corresponding to the target area in a geographic information system, and acquiring an update time point of each data update and a digital elevation value corresponding to the elevation value observation point when each data update is performed from the historical data; wherein the historical data comprises an update time point of each mapping data update, data update content, a data acquisition time interval for a target area in a geographic information system and elevation value data acquired each time;
the difference value acquisition module is used for acquiring a digital elevation value difference value corresponding to the elevation value observation site before and after each data update according to a digital elevation value corresponding to the elevation value observation site during each data update;
the judgment module is used for respectively judging whether the digital elevation difference value corresponding to each elevation observation site exceeds a preset first difference value threshold value; when the number of the elevation observation points corresponding to the digital elevation difference exceeding the preset first difference threshold meets a preset number condition, marking the data updating time point; wherein the preset quantity condition is as follows:
H≥INT(0.38×Hz)
wherein H represents the number of elevation observation sites corresponding to the digital elevation difference exceeding the preset first difference threshold; hzRepresenting the total number of the observation sites with the elevation values; INT () represents rounding up;
and the interval setting module is used for acquiring the image acquisition time interval according to the updating time point of each data updating and the updating time point with the mark. Wherein the image acquisition time interval is obtained by the following formula:
wherein T represents an image acquisition time interval; m represents the number of the update time points with marks; n represents the total number of the update time points of the geographic information system data update; t isiIndicating the ith data updateThe length of time since the last data update; t isjRepresenting the time interval between the jth marked updating time point and the last marked updating time point; t is0Representing a data acquisition time interval for a target area within a geographic information system; ciThe number of data acquisition time intervals for the target area in the geographic information system, which is passed by the mapping data update of the ith geographic information system, is represented; w0Representing an elevation value numerical value corresponding to a preset first difference threshold; wpRepresenting the average value of the digital elevation difference values of all the elevation observation points exceeding a preset first difference value threshold value when the mapping data of the geographic information system is updated each time; w represents the total variation of the digital elevation value corresponding to the elevation value observation point of the most original geospatial data of the target area when the geographic information system updates the mapping data last time.
Further, the region dividing module includes:
the position acquisition module is used for acquiring the position of each elevation value observation position;
the linear distance acquisition module is used for acquiring a linear distance value between two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point;
the radius obtaining module is used for obtaining an area radius according to a linear distance value between the two elevation observation points which are closest to each elevation observation point and each elevation observation point, wherein the area radius is as follows:
wherein R represents a region radius; r1Representing a linear distance value between one elevation value observation site with a closer distance of the two elevation value observation sites with the closest distance to each elevation value observation site; r2Representing two heights with the two height observation points being nearest to each otherAnd the straight line distance value between one elevation value observation site with a longer distance in the range value observation sites and each elevation value observation site.
The area range acquisition module is used for acquiring a plurality of area ranges by taking each elevation value observation site as a circle center and taking the area radius as a radius;
and the area image acquisition module is used for acquiring the area image corresponding to each area range according to the area ranges.
Further, the analysis module includes:
the first updating judgment module is used for extracting regional geographic space information corresponding to the regional position according to the regional position corresponding to the regional image, and determining whether to update the mapping data according to an elevation value judgment rule according to an existing elevation value data point and an elevation value observation site which are arranged in the geographic information system and are located in the regional geographic space information corresponding to the regional position;
and the second updating judgment module is used for extracting the road condition change rate in the area images according to the area positions corresponding to the area images, and updating the mapping data of the target area when the road condition change rates corresponding to two or more area images exceed a preset road change rate threshold value.
Further, the elevation value determination rule includes:
updating the mapping data of the target area when the difference value of the elevation value of any one of the elevation value observation points in the area geospatial information corresponding to the area position relative to the elevation value updated by the mapping data at the last time exceeds a preset second difference value threshold;
when the difference value of the elevation value observation site in the area geospatial information corresponding to the area position relative to the elevation value updated by the last mapping data does not exceed a preset second difference value threshold value, extracting the current elevation value of the existing elevation value data point in the area geospatial information corresponding to the area position and the current elevation value of the elevation value observation site, wherein the current elevation value is set in the geographic information system; setting an updated elevation value of the last mapping data of an elevation value data point in the geographical space information of the area corresponding to the area position and an updated elevation value of the last mapping data of the elevation value observation site in the geographical information system, and acquiring an elevation value difference value corresponding to the elevation value data point and an elevation value difference value corresponding to the elevation value observation site; and updating the mapping data of the target area when any one of the absolute value sum of the difference values of the elevation values corresponding to the elevation value data points and the absolute value sum of the difference values of the elevation values corresponding to the elevation value observation points exceeds a preset sum threshold.
The invention has the beneficial effects that:
the surveying and mapping data acquisition system and method based on the geographical spatial information data surveying and mapping provided by the invention can effectively improve the updating timeliness of the surveying and mapping data and the matching between the surveying and mapping data updating and the actual geographical environment change condition through the timeliness of the surveying and mapping data acquisition, and effectively prevent the problem of inaccurate geographical spatial data information caused by untimely updating of the surveying and mapping data. Meanwhile, the key time point for updating the mapping data can be acquired through the time interval of data acquisition according to the actual situation of change of the landform, and the problem that the operation burden of the geographic information system is too heavy due to unnecessary updating of the mapping data is prevented.
Drawings
FIG. 1 is a first flow chart of the method of the present invention;
FIG. 2 is a second flow chart of the method of the present invention;
FIG. 3 is a system block diagram of the method of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The embodiment of the invention provides a surveying and mapping data acquisition method based on geospatial information data surveying and mapping, as shown in fig. 1, the surveying and mapping data acquisition method comprises the following steps:
s1, extracting historical data of the geospatial information corresponding to the target area in a geographic information system, and setting an image acquisition time interval according to the historical data;
s2, acquiring images of the environment information of the target area according to the image acquisition time interval, and acquiring an environment image of the target area;
s3, carrying out region segmentation on the environment image of the target region to obtain a plurality of region images;
s4, extracting the geographic space information corresponding to the area image from the geographic information system corresponding to the target area according to the area image;
and S5, analyzing the area image and the geographic spatial information corresponding to the area image respectively, and determining whether to update the mapping data.
The working principle of the technical scheme is as follows: firstly, extracting historical data of geographic spatial information corresponding to a target area in a geographic information system, and setting an image acquisition time interval according to the historical data; then, acquiring an image of the environment information of the target area according to the image acquisition time interval to obtain an environment image of the target area; then, carrying out region segmentation on the environment image of the target region to obtain a plurality of region images; then, extracting the geographic space information corresponding to the area image from the geographic information system corresponding to the target area according to the area image; and finally, analyzing the area image and the geographic spatial information corresponding to the area image respectively to determine whether to update the mapping data.
The effect of the above technical scheme is as follows: according to the surveying and mapping data acquisition method based on the geospatial information data surveying and mapping provided by the embodiment, the updating timeliness of the surveying and mapping data and the matching between the surveying and mapping data updating and the actual geographic environment change condition can be effectively improved through the timeliness of surveying and mapping data acquisition, and the problem that the geospatial data information is inaccurate due to untimely updating of the surveying and mapping data is effectively prevented. Meanwhile, the key time point for updating the mapping data can be timely acquired through the time interval of data acquisition according to the actual situation of landform change, and the problem that the operation burden of the geographic information system is too heavy due to unnecessary mapping data updating is prevented.
One embodiment of the present invention extracts historical data of geospatial information corresponding to a target area in a geographic information system, and sets an image acquisition time interval according to the historical data, including:
s101, setting a plurality of elevation observation sites in the target area; the elevation value observation site is set according to the actual condition and the topographic characteristics of the target area, and the set standard is a position point with prominent elevation change characteristics in the target area;
s102, extracting historical data of geospatial information corresponding to a target area in a geographic information system, and acquiring an update time point of each data update and a digital elevation value corresponding to the elevation value observation site during each data update from the historical data; the historical data comprises an update time point of each mapping data update, data update content, a data acquisition time interval for a target area in a geographic information system and elevation value data acquired each time;
s103, acquiring a digital elevation value difference value corresponding to the elevation value observation site before and after each data update according to a digital elevation value corresponding to the elevation value observation site during each data update;
s104, respectively judging whether the digital elevation difference value corresponding to each elevation observation site exceeds a preset first difference value threshold value; when the number of the elevation value observation sites corresponding to the digital elevation value difference value exceeding the preset first difference value threshold value meets the preset number condition, marking the data updating time point; wherein the preset quantity condition is as follows:
H≥INT(0.38×Hz)
wherein H represents the number of elevation observation sites corresponding to the digital elevation difference exceeding the preset first difference threshold; hzRepresenting the total number of the observation sites with the elevation values; INT () represents rounding up;
and S105, acquiring an image acquisition time interval according to the updating time point of each data updating and the updating time point with the mark.
Wherein the image acquisition time interval is obtained by the following formula:
wherein T represents an image acquisition time interval; m represents the number of the update time points with marks; n represents the total number of the update time points of the geographic information system data update; t isiIndicating the time length between the ith data update and the last data update; t isjRepresenting the time interval between the jth marked updating time point and the last marked updating time point; t is0Representing a data acquisition time interval for a target area within a geographic information system; ciThe number of data acquisition time intervals for the target area in the geographic information system, which is passed by the mapping data update of the ith geographic information system, is represented; w0Representing an elevation value numerical value corresponding to a preset first difference threshold; wpRepresenting the average value of the digital elevation difference values of all the elevation observation points exceeding a preset first difference value threshold value when the mapping data of the geographic information system is updated each time; w represents the total variation of the digital elevation value corresponding to the elevation value observation point of the most original geospatial data of the target area when the geographic information system updates the mapping data last time.
The working principle of the technical scheme is as follows: firstly, setting a plurality of elevation observation sites in the target area; the elevation value observation site is set according to the actual situation and the topographic characteristics of the target area, and the set standard is a position point with prominent elevation change characteristics in the target area; then, extracting historical data of the geospatial information corresponding to the target area in a geographic information system, and acquiring an updating time point of each data updating and a digital elevation value corresponding to the elevation value observation point during each data updating from the historical data; wherein the historical data comprises an update time point of each mapping data update, data update content, a data acquisition time interval for a target area in a geographic information system and elevation value data acquired each time; then, acquiring a digital elevation value difference value corresponding to the elevation value observation site before and after each data update according to the digital elevation value corresponding to the elevation value observation site during each data update; then, respectively judging whether the digital elevation difference value corresponding to each elevation observation site exceeds a preset first difference value threshold value; when the number of the elevation observation points corresponding to the digital elevation difference exceeding the preset first difference threshold meets a preset number condition, marking the data updating time point; and finally, acquiring the image acquisition time interval according to the updating time point of each data updating and the updating time point with the mark.
The effect of the above technical scheme is: the image acquisition time interval acquired in the above mode can be set in combination with the actual change of the geographic position, so that the timeliness and reasonability of setting the data acquisition time interval can be effectively improved, and the problem that the mapping data is not updated timely due to the single fixed data acquisition time interval is effectively prevented.
Meanwhile, the image acquisition time interval acquired through the formula can acquire the updated key time point of the mapping data through the data acquisition time interval according to the actual situation of the change of the landform, so that the problem that the operation burden of the geographic information system is too heavy due to unnecessary mapping data updating is prevented. On the other hand, the setting adjustment of the image acquisition time interval is changed according to the actual situation of the change of the landform, the coordination between the image acquisition time interval and the change of the landform can be effectively increased, and the effect that the data acquisition frequency is changed according to the change of the landform can be achieved without manually carrying out system setting.
In an embodiment of the present invention, as shown in fig. 2, performing region segmentation on the environment image of the target region to obtain a plurality of region images, includes:
s301, acquiring the position of each elevation value observation site;
s302, acquiring a linear distance value between two elevation value observation sites closest to each elevation value observation site and each elevation value observation site;
s303, acquiring an area radius according to a linear distance value between the two elevation observation points which are closest to each elevation observation point and each elevation observation point, wherein the area radius is as follows:
wherein R represents a region radius; r is1Representing a linear distance value between one elevation value observation site with a closer distance of the two elevation value observation sites with the closest distance to each elevation value observation site; r2And the linear distance value between one elevation value observation site which is far away from the two elevation value observation sites with the closest distance between the two elevation value observation sites and each elevation value observation site is represented.
S304, taking each elevation value observation point as a circle center, and taking the area radius as a radius to obtain a plurality of area ranges;
s305, obtaining the area image corresponding to each area range according to the area ranges.
The working principle of the technical scheme is as follows: firstly, acquiring the position of each elevation observation point; then, acquiring a linear distance value between two elevation value observation sites closest to each elevation value observation site and each elevation value observation site; then, acquiring the radius of the area according to the linear distance value between the two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point; then, taking each elevation value observation point as a circle center, and taking the area radius as a radius to obtain a plurality of area ranges; and finally, acquiring the area image corresponding to each area range according to the area ranges.
The effect of the above technical scheme is: the number of data processing areas whether to update the mapping data can be effectively reduced by obtaining the area images, the change situation of the landform in the whole area range of the target area is not required to be comprehensively judged, the judgment whether to update the mapping data can be realized by judging the images in the area range, and the updating and judging efficiency of the mapping data is effectively improved. On the other hand, the area radius obtained through the formula can quickly and maximally obtain the effective area range to judge the change of the landform under the condition that the area range is selected to judge the change of the landform form without judging all images in the target area range, and meanwhile, the area range obtained through the formula can effectively improve the accuracy and the representativeness of the judgment of the change of the landform, so that the accuracy of the updating and the judgment of the surveying and mapping data is effectively improved. The problem that the accuracy of updating and judging surveying and mapping data is reduced due to the fact that the accuracy of judging change of the landform is reduced due to unreasonable selection of the area range planning is effectively solved.
In an embodiment of the present invention, analyzing the area image and the geospatial information corresponding to the area image respectively to determine whether to update the mapping data, includes:
s501, extracting area geographic space information corresponding to the area position according to the area position corresponding to the area image, and determining whether to update surveying and mapping data according to an elevation value judgment rule according to an elevation value data point and an elevation value observation point which are arranged in the geographic information system and are located in the area geographic space information corresponding to the area position;
s502, extracting the road condition change rate in the area images according to the area positions corresponding to the area images, and updating the mapping data of the target area when the road condition change rate corresponding to two or more area images exceeds a preset road change rate threshold value.
Wherein the elevation value judgment rule comprises:
updating the mapping data of the target area when the difference value of the elevation value of any one of the elevation value observation points in the area geospatial information corresponding to the area position relative to the elevation value updated by the mapping data at the last time exceeds a preset second difference value threshold;
when the difference value of the elevation value observation site in the area geospatial information corresponding to the area position relative to the elevation value updated by the last mapping data does not exceed a preset second difference value threshold value, extracting the current elevation value of the existing elevation value data point in the area geospatial information corresponding to the area position and the current elevation value of the elevation value observation site, wherein the current elevation value is set in the geographic information system; setting an updated elevation value of the last mapping data of an elevation value data point in the geographical space information of the area corresponding to the area position and an updated elevation value of the last mapping data of the elevation value observation site in the geographical information system, and acquiring an elevation value difference value corresponding to the elevation value data point and an elevation value difference value corresponding to the elevation value observation site; and updating the mapping data of the target area when any one of the absolute value sum of the difference values of the elevation values corresponding to the elevation value data points and the absolute value sum of the difference values of the elevation values corresponding to the elevation value observation points exceeds a preset sum threshold.
The working principle of the technical scheme is as follows: firstly, according to the area position corresponding to the area image, extracting area geographic space information corresponding to the area position, and according to an existing elevation value data point and an elevation value observation site which are arranged in the geographic information system and are positioned in the area geographic space information corresponding to the area position, determining whether to update surveying and mapping data according to an elevation value judgment rule; then, extracting the road condition change rate in the area images according to the area positions corresponding to the area images, and updating the mapping data of the target area when the road condition change rate corresponding to two or more area images exceeds a preset road change rate threshold value.
The effect of the above technical scheme is as follows: by means of the method, the updating judgment efficiency and accuracy of the mapping data can be effectively improved, and the updating timeliness of the mapping data is effectively improved.
This embodiment proposes a surveying data collection system based on geospatial information data surveying, as shown in fig. 3, the surveying data collection system includes:
the acquisition time interval setting module is used for extracting historical data of the geographic spatial information corresponding to the target area in the geographic information system and setting an image acquisition time interval according to the historical data;
the image acquisition module is used for acquiring images of the environment information of the target area according to the image acquisition time interval and acquiring an environment image of the target area;
the region dividing module is used for carrying out region segmentation on the environment image of the target region to obtain a plurality of region images;
the extraction module is used for extracting the geographic space information corresponding to the area image from the geographic information system corresponding to the target area according to the area image;
and the analysis module is used for analyzing the area image and the geographic spatial information corresponding to the area image respectively and determining whether to update the mapping data.
The working principle of the technical scheme is as follows: firstly, extracting historical data of geographic spatial information corresponding to a target area in a geographic information system through an acquisition time interval setting module, and setting an image acquisition time interval according to the historical data; then, an image acquisition module is used for acquiring images of the environment information of the target area according to the image acquisition time interval to acquire an environment image of the target area; then, a region division module is adopted to carry out region division on the environment image of the target region to obtain a plurality of region images; then, extracting geospatial information corresponding to the area image from a geographic information system corresponding to the target area by adopting an extraction module according to the area image; and finally, analyzing the area image and the geographic spatial information corresponding to the area image respectively through an analysis module to determine whether to update the mapping data.
The effect of the above technical scheme is as follows: the surveying and mapping data acquisition system based on the surveying and mapping of the geospatial information data, which is provided by the embodiment, can effectively improve the update timeliness of the surveying and mapping data and the matching between the surveying and mapping data update and the actual geographical environment change condition through the timeliness of surveying and mapping data acquisition, and effectively prevent the problem that the geospatial data information is inaccurate due to untimely updating of the surveying and mapping data. Meanwhile, the key time point for updating the mapping data can be acquired through the time interval of data acquisition according to the actual situation of change of the landform, and the problem that the operation burden of the geographic information system is too heavy due to unnecessary updating of the mapping data is prevented.
In an embodiment of the present invention, the acquisition time interval setting module includes:
the setting module is used for setting a plurality of elevation observation sites in the target area; the elevation value observation site is set according to the actual condition and the topographic characteristics of the target area, and the set standard is a position point with prominent elevation change characteristics in the target area;
the historical data extraction module is used for extracting historical data of the geospatial information corresponding to the target area in a geographic information system, and acquiring an update time point of each data update and a digital elevation value corresponding to the elevation value observation site during each data update from the historical data; the historical data comprises an update time point of each mapping data update, data update content, a data acquisition time interval for a target area in a geographic information system and elevation value data acquired each time;
the difference value acquisition module is used for acquiring a digital elevation value difference value corresponding to the elevation value observation site before and after each data update according to a digital elevation value corresponding to the elevation value observation site during each data update;
the judgment module is used for respectively judging whether the digital elevation difference value corresponding to each elevation observation site exceeds a preset first difference value threshold value; when the number of the elevation observation points corresponding to the digital elevation difference exceeding the preset first difference threshold meets a preset number condition, marking the data updating time point; wherein the preset quantity condition is as follows:
H≥INT(0.38×Hz)
wherein H represents the number of elevation observation sites corresponding to the digital elevation difference exceeding the preset first difference threshold; hzRepresenting the total number of the observation sites with the elevation values; INT () represents rounding up;
and the interval setting module is used for acquiring the image acquisition time interval according to the updating time point of each data updating and the updating time point with the mark. Wherein the image acquisition time interval is obtained by the following formula:
wherein T represents an image acquisition time interval; m represents the number of the updating time points with marks; n represents the total number of the update time points of the geographic information system data update; t isiIndicating the time length between the ith data update and the last data update; t isjRepresenting the time interval between the jth marked updating time point and the last marked updating time point; t is0Representing a data acquisition time interval for a target area within a geographic information system; ciThe number of data acquisition time intervals for the target area in the geographic information system, which is passed by the mapping data update of the ith geographic information system, is represented; w0Representing an elevation value numerical value corresponding to a preset first difference threshold; wpRepresenting the average value of the digital elevation difference values of all the elevation observation points exceeding a preset first difference value threshold value when the mapping data of the geographic information system is updated each time; w represents the total variation of the digital elevation value corresponding to the elevation value observation point of the most original geographic space data relative to the target area when the geographic information system updates the mapping data last time.
The working principle of the technical scheme is as follows: firstly, a plurality of elevation observation sites are set in the target area through a setting module; the elevation value observation site is set according to the actual condition and the topographic characteristics of the target area, and the set standard is a position point with prominent elevation change characteristics in the target area; then, historical data of the geospatial information corresponding to the target area is extracted from a geographic information system by using a historical data extraction module, and an update time point of each data update and a digital elevation value corresponding to the elevation value observation point during each data update are obtained from the historical data; wherein the historical data comprises an update time point of each mapping data update, data update content, a data acquisition time interval for a target area in a geographic information system and elevation value data acquired each time; then, a difference value acquisition module is used for acquiring a digital elevation value difference value corresponding to the elevation value observation site before and after each data update according to the digital elevation value corresponding to the elevation value observation site during each data update; then, respectively judging whether the digital elevation difference value corresponding to each elevation observation site exceeds a preset first difference value threshold value by adopting a judgment module; when the number of the elevation observation points corresponding to the digital elevation difference exceeding the preset first difference threshold meets a preset number condition, marking the data updating time point; and finally, acquiring an image acquisition time interval according to the updating time point of each data updating and the updating time point with the mark by an interval setting module.
The effect of the above technical scheme is as follows: the image acquisition time interval acquired in the mode can be set in combination with the actual change of the geographic position, the timeliness and rationality of the setting of the data acquisition time interval can be effectively improved, and the problem that the mapping data is not updated timely due to the single fixed data acquisition time interval is effectively prevented. Meanwhile, the image acquisition time interval acquired through the formula can acquire the key time point of updating the mapping data through the data acquisition time interval according to the actual situation of change of the landform, so that the problem that the unnecessary updating of the mapping data causes the overload of the running of the geographic information system is prevented. On the other hand, the setting adjustment of the image acquisition time interval is changed according to the actual situation of the change of the landform, the coordination between the image acquisition time interval and the change of the landform can be effectively increased, and the effect that the data acquisition frequency is changed according to the change of the landform can be achieved without manually carrying out system setting.
In an embodiment of the present invention, the region dividing module includes:
the position acquisition module is used for acquiring the position of each elevation value observation position;
the linear distance acquisition module is used for acquiring a linear distance value between two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point;
the radius obtaining module is used for obtaining an area radius according to a linear distance value between the two elevation observation points which are closest to each elevation observation point and each elevation observation point, wherein the area radius is as follows:
wherein R represents a region radius; r1Representing a straight-line distance value between one elevation value observation site which is closer to the two elevation value observation sites and each elevation value observation site; r2And the linear distance value between one elevation value observation site which is far away from the two elevation value observation sites with the closest distance between the two elevation value observation sites and each elevation value observation site is represented.
The area range acquisition module is used for acquiring a plurality of area ranges by taking each elevation value observation point as a circle center and taking the area radius as a radius;
and the area image acquisition module is used for acquiring the area image corresponding to each area range according to the area ranges.
The working principle of the technical scheme is as follows: firstly, acquiring the position of each elevation value observation site through a site position acquisition module; then, a linear distance obtaining module is used for obtaining a linear distance value between two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point; and then, acquiring the radius of the area according to the linear distance value between the two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point through a radius acquisition module. Acquiring a plurality of area ranges by using an area range acquisition module and taking each elevation value observation point as a circle center and the area radius as a radius; and finally, acquiring a region image corresponding to each region range through a region image acquisition module according to the region ranges.
The effect of the above technical scheme is as follows: the number of data processing areas whether to update the mapping data can be effectively reduced by obtaining the area images, the change situation of the landform in the whole area range of the target area is not required to be comprehensively judged, the judgment whether to update the mapping data can be realized by judging the images in the area range, and the updating and judging efficiency of the mapping data is effectively improved. On the other hand, the area radius obtained through the formula can quickly and maximally obtain the effective area range to judge the change of the landform under the condition that the area range is selected to judge the change of the landform form without judging all images in the target area range, and meanwhile, the area range obtained through the formula can effectively improve the accuracy and the representativeness of the judgment of the change of the landform, so that the accuracy of the updating and the judgment of the surveying and mapping data is effectively improved. The problem that the accuracy of updating and judging surveying and mapping data is reduced due to the fact that the accuracy of judging change of the landform is reduced due to unreasonable selection of the area range planning is effectively solved.
In one embodiment of the invention, the analysis module comprises:
the first updating judgment module is used for extracting regional geographic space information corresponding to the regional position according to the regional position corresponding to the regional image, and determining whether to update the mapping data according to an elevation value judgment rule according to an existing elevation value data point and an elevation value observation site which are arranged in the geographic information system and are located in the regional geographic space information corresponding to the regional position;
and the second updating judgment module is used for extracting the road condition change rate in the area images according to the area positions corresponding to the area images, and updating the mapping data of the target area when the road condition change rate corresponding to two or more area images exceeds a preset road change rate threshold value.
Wherein, the elevation value judgment rule comprises:
updating the mapping data of the target area when the difference value of the elevation value of any one of the elevation value observation points in the area geospatial information corresponding to the area position relative to the elevation value updated by the mapping data at the last time exceeds a preset second difference value threshold;
when the difference value of the elevation value observation site in the area geospatial information corresponding to the area position relative to the elevation value updated by the last mapping data does not exceed a preset second difference value threshold value, extracting the current elevation value of the existing elevation value data point in the area geospatial information corresponding to the area position and the current elevation value of the elevation value observation site, wherein the current elevation value is set in the geographic information system; setting an updated elevation value of the last mapping data of an elevation value data point in the geographical space information of the area corresponding to the area position and an updated elevation value of the last mapping data of the elevation value observation site in the geographical information system, and acquiring an elevation value difference value corresponding to the elevation value data point and an elevation value difference value corresponding to the elevation value observation site; and updating the mapping data of the target area when any one of the absolute value sum of the difference values of the elevation values corresponding to the elevation value data points and the absolute value sum of the difference values of the elevation values corresponding to the elevation value observation points exceeds a preset sum threshold.
The working principle of the technical scheme is as follows: firstly, extracting area geographic space information corresponding to the area position according to the area position corresponding to the area image through an updating judgment module I, and determining whether to update surveying and mapping data according to an elevation value judgment rule according to an existing elevation value data point and an elevation value observation site which are arranged in the geographic information system and are located in the area geographic space information corresponding to the area position; then, the second updating judgment module is used for extracting the road condition change rate in the area image according to the area position corresponding to the area image, and when the road condition change rate corresponding to two or more area images exceeds a preset road change rate threshold value, the mapping data of the target area is updated.
The effect of the above technical scheme is as follows: by means of the method, the updating judgment efficiency and accuracy of the mapping data can be effectively improved, and the updating timeliness of the mapping data is effectively improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for collecting mapping data based on geospatial information data mapping, the method comprising:
extracting historical data of geographic space information corresponding to a target area in a geographic information system, and setting an image acquisition time interval according to the historical data;
acquiring an image of the environment information of the target area according to the image acquisition time interval to obtain an environment image of the target area;
performing region segmentation on the environment image of the target region to obtain a plurality of region images;
extracting geographic space information corresponding to the area image from a geographic information system corresponding to the target area according to the area image;
and analyzing the area image and the geographic spatial information corresponding to the area image respectively to determine whether to update the mapping data.
2. The method according to claim 1, wherein extracting historical data of geospatial information corresponding to a target area in a geographic information system, and setting an image acquisition time interval according to the historical data comprises:
setting a plurality of elevation observation sites in the target area;
extracting historical data of geospatial information corresponding to a target area in a geographic information system, and acquiring an updating time point of each data updating and a digital elevation value corresponding to the elevation value observation point during each data updating from the historical data; wherein the historical data comprises an update time point of each mapping data update, data update content, a data acquisition time interval for a target area in a geographic information system and elevation value data acquired each time;
acquiring a digital elevation value difference value corresponding to the elevation value observation site before and after each data update according to a digital elevation value corresponding to the elevation value observation site during each data update;
respectively judging whether the digital elevation difference value corresponding to each elevation observation site exceeds a preset first difference value threshold value; when the number of the elevation value observation sites corresponding to the digital elevation value difference value exceeding the preset first difference value threshold value meets the preset number condition, marking the data updating time point;
and acquiring an image acquisition time interval according to the updating time point of each data updating and the updating time point with the mark.
3. The method of claim 1, wherein performing region segmentation on the environment image of the target region to obtain a plurality of region images comprises:
acquiring the position of each elevation value observation site;
acquiring a linear distance value between two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point;
acquiring the radius of an area according to the linear distance value between the two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point;
taking each elevation value observation point as a circle center, and taking the area radius as a radius to obtain a plurality of area ranges;
and acquiring the area image corresponding to each area range according to the area ranges.
4. The method of claim 1, wherein analyzing the area image and the geospatial information corresponding to the area image to determine whether to update the mapping data comprises:
extracting area geographic space information corresponding to the area position according to the area position corresponding to the area image, and determining whether to update mapping data according to an elevation value judgment rule according to an elevation value data point and an elevation value observation point which are arranged in the geographic information system and are positioned in the area geographic space information corresponding to the area position;
and extracting the road condition change rate in the area images according to the area positions corresponding to the area images, and updating the mapping data of the target area when the road condition change rate corresponding to two or more area images exceeds a preset road change rate threshold value.
5. The method of collecting mapping data according to claim 4, wherein the elevation determination rule comprises:
updating the mapping data of the target area when the difference value of the elevation value of any one of the elevation value observation points in the area geospatial information corresponding to the area position relative to the elevation value updated by the mapping data at the last time exceeds a preset second difference value threshold;
when the difference value of the elevation value observation site in the area geospatial information corresponding to the area position relative to the elevation value updated by the last mapping data does not exceed a preset second difference value threshold value, extracting the current elevation value of the existing elevation value data point in the area geospatial information corresponding to the area position and the current elevation value of the elevation value observation site, wherein the current elevation value is set in the geographic information system; setting an updated elevation value of the last mapping data of an elevation value data point in the geographical space information of the area corresponding to the area position and an updated elevation value of the last mapping data of the elevation value observation site in the geographical information system, and acquiring an elevation value difference value corresponding to the elevation value data point and an elevation value difference value corresponding to the elevation value observation site; and updating the mapping data of the target area when any one of the absolute value sum of the difference values of the elevation values corresponding to the elevation value data points and the absolute value sum of the difference values of the elevation values corresponding to the elevation value observation points exceeds a preset sum threshold.
6. A survey data collection system based on geospatial information data surveying, the survey data collection system comprising:
the acquisition time interval setting module is used for extracting historical data of the geographic spatial information corresponding to the target area in the geographic information system and setting an image acquisition time interval according to the historical data;
the image acquisition module is used for acquiring images of the environment information of the target area according to the image acquisition time interval and acquiring an environment image of the target area;
the region dividing module is used for carrying out region segmentation on the environment image of the target region to obtain a plurality of region images;
the extraction module is used for extracting the geographic space information corresponding to the area image from the geographic information system corresponding to the target area according to the area image;
and the analysis module is used for analyzing the area image and the geographic spatial information corresponding to the area image respectively and determining whether to update the mapping data.
7. The mapping data acquisition system of claim 6, wherein the acquisition time interval setting module comprises:
the setting module is used for setting a plurality of elevation observation sites in the target area;
the historical data extraction module is used for extracting historical data of the geospatial information corresponding to the target area in a geographic information system, and acquiring an update time point of each data update and a digital elevation value corresponding to the elevation value observation point when each data update is performed from the historical data; wherein the historical data comprises an update time point of each mapping data update, data update content, a data acquisition time interval for a target area in a geographic information system and elevation value data acquired each time;
the difference value acquisition module is used for acquiring a digital elevation value difference value corresponding to the elevation value observation site before and after each data update according to a digital elevation value corresponding to the elevation value observation site during each data update;
the judgment module is used for respectively judging whether the digital elevation difference value corresponding to each elevation observation site exceeds a preset first difference value threshold value; when the number of the elevation observation points corresponding to the digital elevation difference exceeding the preset first difference threshold meets a preset number condition, marking the data updating time point;
and the interval setting module is used for acquiring the image acquisition time interval according to the updating time point of each data updating and the updating time point with the mark.
8. The mapping data acquisition system of claim 6, wherein the region partitioning module comprises:
the position acquisition module is used for acquiring the position of each elevation value observation position;
the linear distance acquisition module is used for acquiring a linear distance value between two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point;
the radius acquisition module is used for acquiring the radius of the area according to the linear distance value between the two elevation value observation points which are closest to each elevation value observation point and each elevation value observation point;
the area range acquisition module is used for acquiring a plurality of area ranges by taking each elevation value observation point as a circle center and taking the area radius as a radius;
and the area image acquisition module is used for acquiring the area image corresponding to each area range according to the area ranges.
9. The mapping data acquisition system of claim 6, wherein the analysis module comprises:
the first updating judgment module is used for extracting regional geographic space information corresponding to the regional position according to the regional position corresponding to the regional image, and determining whether to update the mapping data according to an elevation value judgment rule according to an existing elevation value data point and an elevation value observation site which are arranged in the geographic information system and are located in the regional geographic space information corresponding to the regional position;
and the second updating judgment module is used for extracting the road condition change rate in the area images according to the area positions corresponding to the area images, and updating the mapping data of the target area when the road condition change rate corresponding to two or more area images exceeds a preset road change rate threshold value.
10. The system for acquiring mapping data according to claim 9, wherein the elevation determination rule comprises:
updating the mapping data of the target area when the difference value of the elevation value of any one of the elevation value observation points in the area geospatial information corresponding to the area position relative to the elevation value updated by the mapping data at the last time exceeds a preset second difference value threshold;
when the difference value of the elevation value observation site in the area geospatial information corresponding to the area position relative to the elevation value updated by the last mapping data does not exceed a preset second difference value threshold value, extracting the current elevation value of the existing elevation value data point in the area geospatial information corresponding to the area position and the current elevation value of the elevation value observation site, wherein the current elevation value is set in the geographic information system; setting an updated elevation value of the last mapping data of an elevation value data point in the geographical space information of the area corresponding to the area position and an updated elevation value of the last mapping data of the elevation value observation site in the geographical information system, and acquiring an elevation value difference value corresponding to the elevation value data point and an elevation value difference value corresponding to the elevation value observation site; and updating the mapping data of the target area when any one of the absolute value sum of the difference values of the elevation values corresponding to the elevation value data points and the absolute value sum of the difference values of the elevation values corresponding to the elevation value observation points exceeds a preset sum threshold.
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