CN112985319A - Method and device for detecting accuracy of three-dimensional digital earth model and storage medium - Google Patents
Method and device for detecting accuracy of three-dimensional digital earth model and storage medium Download PDFInfo
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Abstract
The invention provides a method and a device for detecting the accuracy of a three-dimensional digital earth model and a storage medium, which are used for detecting the accuracy of the three-dimensional digital earth model. The method for detecting the accuracy of the three-dimensional digital earth model comprises the following steps: aiming at each intersection point in the longitude and latitude grid diagram, respectively acquiring a first coordinate true value of the intersection point and a first observation value of the intersection point in the three-dimensional digital earth model; determining an error value corresponding to the intersection point according to the first coordinate true value and the first observation value of the intersection point; and judging whether the three-dimensional digital earth is accurate or not according to the error value corresponding to each intersection point.
Description
Technical Field
The invention relates to the technical field of digital earth, in particular to a method and a device for detecting the accuracy of a three-dimensional digital earth model and a storage medium.
Background
With the rapid development of geographic information technology and computer network technology, the research and application of multi-resolution, multi-temporal, multi-variety and multi-dimensional geographic spatial information is more and more, the information expression of the traditional two-dimensional space is difficult to meet the increasing demand, and the geographic information expression in the three-dimensional space presents an increasingly important trend. In 1998, the concept of the digital earth is proposed by the subsidiary president gol in the time-of-the-year U.S., the development of the digital earth is greatly advanced, and a series of digital earth software is developed at home and abroad.
The digital earth, i.e., the digitized earth, is a digital model of the earth. Due to different application ranges and precision requirements, standards such as ellipsoid parameters and reference coordinate systems adopted in the process of establishing the digital earth model are inconsistent, and how to detect the accuracy of the three-dimensional digital earth model becomes one of the technical problems to be solved urgently in the prior art.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting the accuracy of a three-dimensional digital earth model and a storage medium, which are used for detecting the accuracy of the three-dimensional digital earth model.
The embodiment of the invention provides a method for detecting the accuracy of a three-dimensional digital earth model, which comprises the following steps:
aiming at each intersection point in the longitude and latitude grid diagram, respectively acquiring a first coordinate true value of the intersection point and a first observation value of the intersection point in the three-dimensional digital earth model;
determining an error value corresponding to the intersection point according to the first coordinate true value and the first observation value of the intersection point;
and judging whether the three-dimensional digital earth is accurate or not according to the error value corresponding to each intersection point.
In one embodiment, determining whether the three-dimensional digital earth is accurate according to the error value corresponding to each intersection point specifically includes:
judging whether an error value corresponding to at least one intersection point is larger than an abnormal lower limit or not;
and if the error value corresponding to at least one intersection point is judged to be larger than the lower abnormal limit, determining that the three-dimensional digital earth is inaccurate.
The method for detecting the accuracy of the three-dimensional digital earth model provided by the embodiment of the invention further comprises the following steps:
if the error value corresponding to each intersection point is not greater than the abnormal lower limit, respectively acquiring a second coordinate true value of the control point and a second observation value of the control point in the three-dimensional digital earth model aiming at each control point in the image file;
determining an average root mean square error value corresponding to each control point according to the second coordinate true value and the second observation value of each control point;
if the average root mean square error value is less than the tolerance value, determining that the three-dimensional digital earth is inaccurate;
and if the mean root mean square error value is not less than the tolerance value, determining that the three-dimensional digital earth is accurate.
In one embodiment, the lower anomaly limit is determined as follows:
respectively determining the average value and the standard deviation of error values corresponding to each intersection point;
and determining the lower abnormal limit according to the average value and the standard deviation of the error values corresponding to the intersection points.
In one embodiment, the mean root mean square error value is determined according to the following equation:
wherein:
n is the number of control points in the image file;
xact,iand yact,iIs a second coordinate true value corresponding to the control point i;
xobs,iand yobs,iIs the second observed value corresponding to the control point i point.
The invention also provides a device for detecting the accuracy of the three-dimensional digital earth model, which comprises:
the device comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for respectively acquiring a first coordinate true value of each intersection point in a longitude and latitude grid diagram and a first observation value of the intersection point in a three-dimensional digital earth model;
a first determining unit, configured to determine an error value corresponding to the intersection according to a first coordinate true value and a first observation value of the intersection;
and the judging unit is used for judging whether the three-dimensional digital earth is accurate or not according to the error value corresponding to each intersection point.
In an embodiment, the determining unit is specifically configured to determine whether an error value corresponding to at least one intersection is greater than an abnormal lower limit; and if the error value corresponding to at least one intersection point is judged to be larger than the lower abnormal limit, determining that the three-dimensional digital earth is inaccurate.
In an embodiment, the apparatus for detecting accuracy of a three-dimensional digital earth model provided in an embodiment of the present invention further includes:
a second obtaining unit, configured to, if the error value corresponding to each intersection is not greater than the abnormal lower limit, respectively obtain, for each control point in the image file, a second coordinate true value of the control point and a second observation value of the control point in the three-dimensional digital earth model;
the second determining unit is used for determining the mean root mean square error value corresponding to each control point according to the second coordinate true value and the second observation value of each control point;
a third determination unit for determining that the three-dimensional digital earth is inaccurate if the average root mean square error value is less than a tolerance value; and if the mean root mean square error value is not less than the tolerance value, determining that the three-dimensional digital earth is accurate.
In an embodiment, the apparatus for detecting accuracy of a three-dimensional digital earth model provided in an embodiment of the present invention further includes:
a fourth determining unit, configured to determine an average value and a standard deviation of the error values corresponding to the intersections, respectively; and determining the lower abnormal limit according to the average value and the standard deviation of the error values corresponding to the intersection points.
In an embodiment, the apparatus for detecting accuracy of a three-dimensional digital earth model provided in an embodiment of the present invention further includes:
a fifth determining unit for determining the mean root mean square error value according to the following formula:
wherein:
n is the number of control points in the image file;
xact,iand yact,iIs a second coordinate true value corresponding to the control point i;
xobs,iand yobs,iIs the second observed value corresponding to the control point i point.
In a third aspect, a computing device is provided, the computing device comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of any of the above three-dimensional digital earth model accuracy detection methods.
In a fourth aspect, a computer storage medium is provided, on which a computer program is stored, which, when being executed by a processor, implements the steps of any one of the above-mentioned methods for detecting accuracy of a three-dimensional digital earth model.
By adopting the technical scheme, the invention at least has the following advantages:
according to the method, the device and the storage medium for detecting the accuracy of the three-dimensional digital earth model, the error value corresponding to each intersection point is determined according to the coordinate true value and the observed value corresponding to each intersection point in the longitude and latitude grid diagram, and whether the three-dimensional digital earth is accurate or not is judged according to the error value corresponding to each intersection point.
Drawings
FIG. 1 is a flow chart of a method for detecting the accuracy of a three-dimensional digital earth model according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a three-dimensional digital earth model accuracy detection apparatus according to an embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
It should be noted that the terms "first", "second", and the like in the description and the claims of the embodiments of the present invention and in the drawings described above are used for distinguishing similar objects and not necessarily for describing a particular order or sequence. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein.
Reference herein to "a plurality or a number" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
As shown in fig. 1, which is a schematic flow chart of an implementation of the method for detecting accuracy of a three-dimensional digital earth model according to an embodiment of the present invention, the method includes the following steps:
and S11, acquiring a first coordinate true value of each intersection point in the graticule and a first observation value of the intersection point in the three-dimensional digital earth model respectively.
In this step, a theoretical true value of the coordinates of the grid crossing point in the graticule that meets the 2000 Chinese geodetic surveying standard may be obtained, wherein the theoretical true values of the coordinates of the grid crossing point in the graticule and the graticule that meets the 2000 Chinese geodetic surveying standard may be provided by a surveying and mapping department. Preferably, the coordinate points involved in step S11 may further include 4 corner points in the graticule. The graticule and the three-dimensional digital pilling use the same set of ground reference.
In addition, the graticule is opened in the three-dimensional digital earth to be detected, and the observation value of the coordinates of the cross points of the graticule is obtained by clicking the graticule in the three-dimensional digital earth by using a mouse. Specifically, a theoretical true value of the graticule intersection is input into the search box through a search function provided by the digital earth, the digital earth is positioned to the graticule intersection, and the mouse is hovered over the intersection to obtain an observed value of coordinates of the graticule intersection.
Optionally, for each intersection, a mouse may be used to click for multiple times, and the average value of the obtained values each time is taken as the observed value of the observation point.
For example, the observed values of the graticule intersections in each graticule are obtained 5 times by mouse clicking, and the average value is taken.
And S12, determining an error value corresponding to the intersection point according to the first coordinate true value and the first observation value of the intersection point.
In this step, an error value corresponding to the intersection point may be determined according to a difference between the first true coordinate value and the first observed value.
And S13, judging whether the three-dimensional digital earth is accurate or not according to the error value corresponding to each intersection point.
In this step, it can be determined whether there is an error value corresponding to at least one intersection point greater than an abnormal lower limit; and if the error value corresponding to at least one intersection point is judged to be larger than the lower abnormal limit, determining that the three-dimensional digital earth is inaccurate. And if the error value corresponding to at least one intersection point is larger than the lower abnormal limit, the three-dimensional digital earth model does not conform to the 2000 Chinese geodetic survey standard.
Wherein, the lower abnormality limit may be determined according to the following method: respectively determining the average value and the standard deviation of error values corresponding to each intersection point; and determining the lower abnormal limit according to the average value and the standard deviation of the error values corresponding to the intersection points.
Taking an error value set consisting of error values corresponding to each intersection point as C { C1, C2, …, cn }, as an example, the average value X and the standard deviation σ of the error value set C are determined, in the embodiment of the present invention, the abnormal lower limit value may be determined according to the following formula: x +3 σ.
It should be noted that the above formula is only one implementation of determining the lower limit of the abnormality according to the error value, and in a specific implementation, the lower limit of the abnormality may be defined according to needs, which is not limited by the embodiment of the present invention.
In specific implementation, if the error value corresponding to each intersection point is not greater than the abnormal lower limit, the method for detecting the accuracy of the three-dimensional digital earth model provided by the embodiment of the invention may further include the following steps: aiming at each control point in the image file, respectively acquiring a second coordinate true value of the control point and a second observation value of the control point in the three-dimensional digital earth model; determining an average root mean square error value corresponding to each control point according to the second coordinate true value and the second observation value of each control point; if the average root mean square error value is less than the tolerance value, determining that the three-dimensional digital earth is inaccurate; and if the mean root mean square error value is not less than the tolerance value, determining that the three-dimensional digital earth is accurate. A
Specifically, if the error value corresponding to at least one intersection point is greater than the abnormal lower limit, the actual value of the control point coordinate in the image file conforming to the 2000 chinese geodetic standard is obtained. In specific implementation, the image file and the second coordinate true value corresponding to the control point are provided by a surveying and mapping department, and the image file and the three-dimensional digital earth use the same set of geodetic reference. And the second observation value corresponding to each control point is obtained according to the following mode: and opening the image file in the three-dimensional digital earth aiming at each control point, and clicking a second coordinate true value of the control point by using a mouse to obtain a corresponding observation value. Specifically, an image area containing a control point is enlarged to the highest level of the image on the digital earth, and a mouse is hovered over the control point to obtain a corresponding observation value.
Preferably, the mouse can be used for performing multiple times of clicking, and the average value of the observation values obtained each time is used as the observation value corresponding to the control point. For example, the observation acquisition for each control point may be clicked 5 times by a mouse, and the average value is taken.
In specific implementation, the tolerance value may be preset according to actual needs, and this is not limited in the embodiment of the present invention.
In one embodiment, the mean root mean square error value may be determined according to the following equation:
wherein:
n is the number of control points in the image file;
xact,iand yact,iIs a second coordinate true value corresponding to the control point i;
xobs,iand yobs,iIs the second observed value corresponding to the control point i point.
According to the method for detecting the accuracy of the three-dimensional digital earth model, provided by the embodiment of the invention, an error value set is determined according to the crossing points of the graticule, an abnormal lower limit value is obtained, and theoretical inspection is carried out on the three-dimensional earth model; and calculating whether the average root mean square error is within the tolerance value according to the image control points, and further carrying out application inspection on the three-dimensional digital earth model. The method has strong universality, can be used for checking the accuracy of the three-dimensional earth constructed based on different ellipsoid parameters and different measurement standards, and provides basic support for the application established on the three-dimensional earth.
Based on the same technical concept, an embodiment of the present invention further provides a device for detecting accuracy of a three-dimensional digital earth model, as shown in fig. 2, including:
the first obtaining unit 21 is configured to, for each intersection in the graticule, respectively obtain a first coordinate true value of the intersection and a first observation value of the intersection in the three-dimensional digital earth model;
a first determining unit 22, configured to determine an error value corresponding to the intersection according to the first true coordinate value and the first observed value of the intersection;
and the judging unit 23 is configured to judge whether the three-dimensional digital earth is accurate according to the error value corresponding to each intersection.
In an embodiment, the determining unit is specifically configured to determine whether an error value corresponding to at least one intersection is greater than an abnormal lower limit; and if the error value corresponding to at least one intersection point is judged to be larger than the lower abnormal limit, determining that the three-dimensional digital earth is inaccurate.
In an embodiment, the apparatus for detecting accuracy of a three-dimensional digital earth model provided in an embodiment of the present invention further includes:
a second obtaining unit, configured to, if the error value corresponding to each intersection is not greater than the abnormal lower limit, respectively obtain, for each control point in the image file, a second coordinate true value of the control point and a second observation value of the control point in the three-dimensional digital earth model;
the second determining unit is used for determining the mean root mean square error value corresponding to each control point according to the second coordinate true value and the second observation value of each control point;
a third determination unit for determining that the three-dimensional digital earth is inaccurate if the average root mean square error value is less than a tolerance value; and if the mean root mean square error value is not less than the tolerance value, determining that the three-dimensional digital earth is accurate.
In an embodiment, the apparatus for detecting accuracy of a three-dimensional digital earth model provided in an embodiment of the present invention further includes:
a fourth determining unit, configured to determine an average value and a standard deviation of the error values corresponding to the intersections, respectively; and determining the lower abnormal limit according to the average value and the standard deviation of the error values corresponding to the intersection points.
In an embodiment, the apparatus for detecting accuracy of a three-dimensional digital earth model provided in an embodiment of the present invention further includes:
a fifth determining unit for determining the mean root mean square error value according to the following formula:
wherein:
n is the number of control points in the image file;
xact,iand yact,iIs a second coordinate true value corresponding to the control point i;
xobs,iand yobs,iIs the second observed value corresponding to the control point i point.
Based on the same technical concept, an embodiment of the present invention further provides a computing apparatus, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of any of the above three-dimensional digital earth model accuracy detection methods.
Based on the same technical concept, the embodiment of the invention also provides a computer storage medium, wherein a computer program is stored on the computer storage medium, and when being executed by a processor, the computer program realizes the steps of any one of the three-dimensional digital earth model accuracy detection methods.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings and description that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention.
Claims (10)
1. A method for detecting the accuracy of a three-dimensional digital earth model is characterized by comprising the following steps:
aiming at each intersection point in the longitude and latitude grid diagram, respectively acquiring a first coordinate true value of the intersection point and a first observation value of the intersection point in the three-dimensional digital earth model;
determining an error value corresponding to the intersection point according to the first coordinate true value and the first observation value of the intersection point;
and judging whether the three-dimensional digital earth is accurate or not according to the error value corresponding to each intersection point.
2. The method according to claim 1, wherein determining whether the three-dimensional digital earth is accurate according to the error value corresponding to each intersection comprises:
judging whether an error value corresponding to at least one intersection point is larger than an abnormal lower limit or not;
and if the error value corresponding to at least one intersection point is judged to be larger than the lower abnormal limit, determining that the three-dimensional digital earth is inaccurate.
3. The method of claim 2, further comprising:
if the error value corresponding to each intersection point is not greater than the abnormal lower limit, respectively acquiring a second coordinate true value of the control point and a second observation value of the control point in the three-dimensional digital earth model aiming at each control point in the image file;
determining an average root mean square error value corresponding to each control point according to the second coordinate true value and the second observation value of each control point;
if the average root mean square error value is less than the tolerance value, determining that the three-dimensional digital earth is inaccurate;
and if the mean root mean square error value is not less than the tolerance value, determining that the three-dimensional digital earth is accurate.
4. The method of claim 2, wherein the lower anomaly limit is determined according to the following method:
respectively determining the average value and the standard deviation of error values corresponding to each intersection point;
and determining the lower abnormal limit according to the average value and the standard deviation of the error values corresponding to the intersection points.
5. The method of claim 3, wherein the mean root mean square error value is determined according to the following equation:
wherein:
n is the number of control points in the image file;
xact,iand yact,iIs a second coordinate true value corresponding to the control point i;
xobs,iand yobs,iIs the second observed value corresponding to the control point i point.
6. A three-dimensional digital earth model accuracy detection device, comprising:
the device comprises a first acquisition unit, a second acquisition unit and a third acquisition unit, wherein the first acquisition unit is used for respectively acquiring a first coordinate true value of each intersection point in a longitude and latitude grid diagram and a first observation value of the intersection point in a three-dimensional digital earth model;
a first determining unit, configured to determine an error value corresponding to the intersection according to a first coordinate true value and a first observation value of the intersection;
and the judging unit is used for judging whether the three-dimensional digital earth is accurate or not according to the error value corresponding to each intersection point.
7. The apparatus of claim 6,
the judging unit is specifically configured to judge whether a reference value corresponding to at least one intersection is greater than an abnormal lower limit; and if the error value corresponding to at least one intersection point is judged to be larger than the lower abnormal limit, determining that the three-dimensional digital earth is inaccurate.
8. The apparatus of claim 7, further comprising:
a second obtaining unit, configured to, if the error value corresponding to each intersection is not greater than the abnormal lower limit, respectively obtain, for each control point in the image file, a second coordinate true value of the control point and a second observation value of the control point in the three-dimensional digital earth model;
the second determining unit is used for determining the mean root mean square error value corresponding to each control point according to the second coordinate true value and the second observation value of each control point;
a third determination unit for determining that the three-dimensional digital earth is inaccurate if the average root mean square error value is less than a tolerance value; and if the mean root mean square error value is not less than the tolerance value, determining that the three-dimensional digital earth is accurate.
9. A computing device, the computing device comprising: memory, processor and computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the method according to any one of claims 1 to 5.
10. A computer storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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