CN112985319B - Method, device and storage medium for detecting accuracy of three-dimensional digital earth model - Google Patents
Method, device and storage medium for detecting accuracy of three-dimensional digital earth model Download PDFInfo
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Abstract
The invention provides a method, a device and a storage medium for detecting the accuracy of a three-dimensional digital earth model, which are used for detecting the accuracy of the three-dimensional digital earth model. The three-dimensional digital earth model accuracy detection method comprises the following steps: for each intersection point in the longitude and latitude grid chart, 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 present invention relates to the field of digital earth technologies, and in particular, to a method, an apparatus, and a storage medium for detecting accuracy of a three-dimensional digital earth model.
Background
With rapid development of geographic information technology and computer network technology, research and application of multi-resolution, multi-phase, multi-kind and multi-dimension geographic space information are more and more, the information expression of the traditional two-dimensional space is difficult to meet the increasing demands, and the geographic information expression of the three-dimensional space shows an increasingly important trend.
The digital earth, i.e., digitized earth, is a digital model of the earth. Because of different application range and precision requirements, the ellipsoid parameters, reference coordinate system and other standards 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 in the prior art.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a storage medium for detecting the accuracy of a three-dimensional digital earth model, 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:
for each intersection point in the longitude and latitude grid chart, 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;
and if the error value corresponding to at least one intersection point is judged to be larger than the abnormal lower 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 each control point and a second observed 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 greater than a tolerance value, determining that the three-dimensional digital earth is inaccurate;
and if the average root mean square error value is not greater than a tolerance value, determining that the three-dimensional digital earth is accurate.
In one embodiment, the anomaly lower limit is determined as follows:
respectively determining the average value and standard deviation of error values corresponding to all the cross points;
and determining the abnormal lower limit according to the average value and the standard deviation of the error values corresponding to the cross points.
In one embodiment, the average root mean square error value is determined according to the following formula:
wherein:
n is the number of control points in the image file;
x act,i and y act,i Is the true value of the second coordinate corresponding to the control point i;
x obs,i and y obs,i Is the second observation value corresponding to the point i of the control point.
The invention also provides a device for detecting the accuracy of the three-dimensional digital earth model, which comprises the following steps:
the first acquisition unit is used for respectively acquiring a first coordinate true value of each crossing point and a first observation value thereof in the three-dimensional digital earth model aiming at each crossing point in the longitude and latitude grid diagram;
the first determining unit is used for 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 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 one embodiment, the judging unit is specifically configured to judge whether an error value corresponding to at least one intersection is greater than an anomaly lower limit; and if the error value corresponding to at least one intersection point is judged to be larger than the abnormal lower limit, determining that the three-dimensional digital earth is inaccurate.
In one embodiment, the three-dimensional digital earth model accuracy detection device provided by the embodiment of the invention further comprises:
the second obtaining unit is used for respectively obtaining a second coordinate true value of each 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 if the error value corresponding to each intersection point is not greater than the abnormal lower limit;
the second determining unit is used for 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;
a third determining unit, configured to determine that the three-dimensional digital earth is inaccurate if the average root mean square error value is greater than a tolerance value; and if the average root mean square error value is not greater than a tolerance value, determining that the three-dimensional digital earth is accurate.
In one embodiment, the three-dimensional digital earth model accuracy detection device provided by the embodiment of the invention further comprises:
a fourth determining unit, configured to determine an average value and a standard deviation of error values corresponding to the respective intersections; and determining the abnormal lower limit according to the average value and the standard deviation of the error values corresponding to the cross points.
In one embodiment, the three-dimensional digital earth model accuracy detection device provided by the embodiment of the invention further comprises:
a fifth determining unit, configured to determine the average root mean square error value according to the following formula:
wherein:
n is the number of control points in the image file;
x act,i and y act,i Is the true value of the second coordinate corresponding to the control point i;
x obs,i and y obs,i Is the second observation value corresponding to the point i of the control point.
In a third aspect, there is provided a computing device comprising: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the computer program realizes the steps of any three-dimensional digital earth model accuracy detection method when being executed by the processor.
In a fourth aspect, a computer storage medium is provided, where a computer program is stored, where the computer program, when executed by a processor, implements the steps of any of the three-dimensional digital earth model accuracy detection methods described above.
By adopting the technical scheme, the invention has at least 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 chart, whether the three-dimensional digital earth is accurate or not is judged according to the error value corresponding to each intersection point, through the process, the accuracy of the three-dimensional digital earth model can be rapidly and accurately identified, the key problem of basic platform construction of an information system is solved, and technical support is provided for application established on the three-dimensional digital earth.
Drawings
FIG. 1 is a flow chart of a method for detecting 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 detecting device according to an embodiment of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description of the present invention is given 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 the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein.
Reference herein to "a plurality of" or "a number" means two or more than two. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
Fig. 1 is a schematic diagram of an implementation flow of a three-dimensional digital earth model accuracy detection method according to an embodiment of the present invention, including the following steps:
s11, respectively acquiring a first coordinate true value of each crossing point and a first observation value thereof in the three-dimensional digital earth model aiming at each crossing point in the longitude and latitude grid chart.
In this step, a theoretical true value of the coordinates of the intersection points of the longitude and latitude networks in the longitude and latitude network diagram meeting the 2000 national geodetic standard can be obtained, where the theoretical true value of the coordinates of the intersection points of the longitude and latitude networks in the longitude and latitude network diagram meeting the 2000 national geodetic standard can be provided by the mapping department. Preferably, the coordinate points involved in step S11 may further include 4 corner points in the longitude and latitude grid map. The same set of ground references is used for the longitude and latitude grid patterns and the three-dimensional digital pilling.
In addition, the longitude and latitude grid patterns are opened in the three-dimensional digital earth to be detected, and the observation value of the intersection point coordinates of the longitude and latitude grid patterns is obtained by pointing and selecting with a mouse in the three-dimensional digital earth. Specifically, a theoretical true value of a longitude and latitude grid intersection point can be input in a search box through a search function provided by the digital earth, the digital earth is positioned to the longitude and latitude grid intersection point, a mouse is hovered at the intersection point, and an observation value of longitude and latitude grid map intersection point coordinates is obtained.
Alternatively, for each intersection point, a mouse may be used to click multiple times, and the average value of each obtained value is taken as the observation value of the observation point.
For example, observations of the crossing points of the warp and weft meshes in each of the warp and weft mesh charts are obtained by pointing 5 times by a mouse and taking an average value.
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, the error value corresponding to the intersection point may be determined according to the difference between the first coordinate true value and the first observed value.
S13, judging whether the three-dimensional digital earth is accurate or not according to the error value corresponding to each intersection point.
In the step, whether an error value corresponding to at least one intersection point is larger than an abnormal lower limit can be judged; and if the error value corresponding to at least one intersection point is judged to be larger than the abnormal lower limit, determining that the three-dimensional digital earth is inaccurate. If the error value corresponding to at least one intersection point is greater than the lower abnormal limit, the three-dimensional digital earth model does not meet the 2000 national geodetic standard.
Wherein the anomaly lower limit may be determined as follows: respectively determining the average value and standard deviation of error values corresponding to all the cross points; and determining the abnormal lower limit according to the average value and the standard deviation of the error values corresponding to the cross points.
Taking the error value set composed of the error values corresponding to each intersection point as C { C1, C2, …, cn } as an example, determining the average value X and standard deviation σ of the error value set C, in the embodiment of the present invention, the anomaly lower limit value may be determined according to the following formula: x+3σ.
It should be noted that the above formula is only one embodiment of determining the lower limit of the anomaly according to the error value, and may be limited according to the need in specific implementation, which is not limited by the embodiment of the present invention.
In implementation, if the error value corresponding to each intersection is not greater than the lower limit of the anomaly, the method for detecting the accuracy of the three-dimensional digital earth model provided by the embodiment of the invention can further comprise the following steps: respectively acquiring a second coordinate true value of each 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 greater than a tolerance value, determining that the three-dimensional digital earth is inaccurate; and if the average root mean square error value is not greater than a tolerance value, determining that the three-dimensional digital earth is accurate. A step of
Specifically, if there is at least one error value corresponding to the intersection point greater than the abnormal lower limit, the actual value of the control point coordinate in the image file meeting the national geodetic standard in 2000 is obtained. In the implementation, the image file and the second coordinate true value corresponding to the control point are provided by the mapping department, and the image file and the three-dimensional digital earth use the same set of ground reference. And the second observed value corresponding to each control point is obtained in the following manner: and opening the image file in the three-dimensional digital earth aiming at each control point, clicking a second coordinate true value of the control point by using a mouse, and obtaining a corresponding observation value. Specifically, an image area containing a control point is enlarged to the highest level of an image on the digital earth, and a mouse hovers over the control point to obtain a corresponding observed value.
Preferably, a mouse can be used for clicking for a plurality of times, and the average value of the observed values obtained each time is used as the observed value corresponding to the control point. For example, the observation of each control point may be taken by pointing 5 times with a mouse, and taking an average.
In specific implementation, the tolerance value may be preset according to actual needs, which is not limited in the embodiment of the present invention.
In one embodiment, the average root mean square error value may be determined according to the following formula:
wherein:
n is the number of control points in the image file;
x act,i and y act,i Is the true value of the second coordinate corresponding to the control point i;
x obs,i and y obs,i Is the second observation value corresponding to the point i of the control point.
According to the three-dimensional digital earth model accuracy detection method provided by the embodiment of the invention, an error value set is determined according to the longitude and latitude network intersection points, 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 point, and further performing application test on the three-dimensional digital earth model. The method has strong universality, can check the accuracy of the three-dimensional earth constructed based on different ellipsoidal parameters and different measurement standards, and provides basic support for application on the three-dimensional earth.
Based on the same technical concept, the embodiment of the invention also provides a device for detecting the accuracy of the three-dimensional digital earth model, as shown in fig. 2, which comprises:
a first obtaining unit 21, configured to obtain, for each intersection in the longitude and latitude grid chart, a first coordinate true value of the intersection and a first observed value thereof 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 coordinate true value and the first observed value of the intersection;
and the judging unit 23 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 one embodiment, the judging unit is specifically configured to judge whether an error value corresponding to at least one intersection is greater than an anomaly lower limit; and if the error value corresponding to at least one intersection point is judged to be larger than the abnormal lower limit, determining that the three-dimensional digital earth is inaccurate.
In one embodiment, the three-dimensional digital earth model accuracy detection device provided by the embodiment of the invention further comprises:
the second obtaining unit is used for respectively obtaining a second coordinate true value of each 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 if the error value corresponding to each intersection point is not greater than the abnormal lower limit;
the second determining unit is used for 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;
a third determining unit, configured to determine that the three-dimensional digital earth is inaccurate if the average root mean square error value is greater than a tolerance value; and if the average root mean square error value is not greater than a tolerance value, determining that the three-dimensional digital earth is accurate.
In one embodiment, the three-dimensional digital earth model accuracy detection device provided by the embodiment of the invention further comprises:
a fourth determining unit, configured to determine an average value and a standard deviation of error values corresponding to the respective intersections; and determining the abnormal lower limit according to the average value and the standard deviation of the error values corresponding to the cross points.
In one embodiment, the three-dimensional digital earth model accuracy detection device provided by the embodiment of the invention further comprises:
a fifth determining unit, configured to determine the average root mean square error value according to the following formula:
wherein:
n is the number of control points in the image file;
x act,i and y act,i Is the true value of the second coordinate corresponding to the control point i;
x obs,i and y obs,i Is the second observation value corresponding to the point i of the control point.
Based on the same technical concept, the embodiment of the invention further provides a computing device, which comprises: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the computer program realizes the steps of any three-dimensional digital earth model accuracy detection method when being executed by the processor.
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 the computer program realizes the steps of any three-dimensional digital earth model accuracy detection method when being executed by a processor.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that these drawings are included in the spirit and scope of the invention, it is not to be limited thereto.
Claims (6)
1. The method for detecting the accuracy of the three-dimensional digital earth model is characterized by comprising the following steps of:
for each intersection in the longitude and latitude grid graph, respectively acquiring a first coordinate true value of the intersection and a first observation value of the intersection in a three-dimensional digital earth model, wherein a longitude and latitude grid intersection theoretical true value is input in a search box through a search function provided by digital earth, the digital earth is positioned to the longitude and latitude grid intersection, and a mouse hovers at the intersection to acquire the first observation value of the longitude and latitude grid graph intersection coordinate;
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;
judging whether the three-dimensional digital earth model is accurate or not according to the error value corresponding to each intersection, and specifically comprising the following steps:
judging whether an error value corresponding to at least one intersection point is larger than an abnormal lower limit;
if the error value corresponding to at least one intersection point is judged to be greater than the abnormal lower limit, determining that the three-dimensional digital earth model is inaccurate;
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 each 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 meeting the 2000 Chinese geodetic standard;
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 greater than a tolerance value, determining that the three-dimensional digital earth model is inaccurate;
and if the average root mean square error value is not larger than the tolerance value, determining that the three-dimensional digital earth model is accurate.
2. The method of claim 1, wherein the anomaly lower bound is determined in accordance with the following method:
respectively determining the average value and standard deviation of error values corresponding to all the cross points;
and determining the abnormal lower limit according to the average value and the standard deviation of the error values corresponding to the cross points.
3. The method of claim 1, wherein the average root mean square error value is determined according to the following formula:
wherein:
n is the number of control points in the image file;
x act,i and y act,i Is the true value of the second coordinate corresponding to the control point i;
x obs,i and y obs,i Is the second observation value corresponding to the point i of the control point.
4. A three-dimensional digital earth model accuracy detection device, comprising:
the first acquisition unit is used for respectively acquiring a first coordinate true value of each intersection point and a first observation value of the intersection point in a three-dimensional digital earth model aiming at each intersection point in the longitude and latitude grid chart, wherein a longitude and latitude grid intersection point theoretical true value is input in a search box through a search function provided by digital earth, the digital earth is positioned to the longitude and latitude grid intersection point, and a mouse hovers at the intersection point to acquire the first observation value of the longitude and latitude grid chart intersection point coordinate;
the first determining unit is used for 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;
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; the judging unit is specifically configured to judge whether a reference value corresponding to at least one intersection point is greater than an abnormal lower limit; if the error value corresponding to at least one intersection point is judged to be greater than the abnormal lower limit, determining that the three-dimensional digital earth model is inaccurate;
the second obtaining unit is used for respectively obtaining a second coordinate true value of each 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 which accords with the 2000 Chinese geodetic standard if the error value corresponding to each intersection point is not greater than the abnormal lower limit;
the second determining unit is used for 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;
a third determining unit, configured to determine that the three-dimensional digital earth model is inaccurate if the average root mean square error value is greater than a tolerance value; and if the average root mean square error value is not larger than the tolerance value, determining that the three-dimensional digital earth model is accurate.
5. A computing device, the computing device comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, which when executed by the processor performs the steps of the method according to any one of claims 1 to 3.
6. A computer storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any of claims 1 to 3.
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