CN113849585B - Topology inspection method, device and medium for surface graph - Google Patents
Topology inspection method, device and medium for surface graph Download PDFInfo
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Abstract
The invention relates to the field of geographic information, and discloses a topology inspection method of a ground surface graph, which comprises the steps of extracting all outer contour line segments corresponding to each surface element according to end points in an outer contour corresponding to each surface element, judging whether adjacent outer contour line segments exist between any two surface elements, using the adjacent outer contour line segments as adjacent line segments, judging whether an included angle between the adjacent line segments reaches a preset included angle threshold value, if so, forming gaps between two surface elements corresponding to the adjacent line segments, using the two surface elements with the gaps as gap unqualified surface elements, and outputting all gap unqualified surface elements in the ground surface graph as unqualified inspection results. The invention thins the inspection object to each surface element, can accurately inspect all gaps in the surface graph, and enables the topology inspection result of the surface graph to be more accurate.
Description
Technical Field
The invention relates to the field of geographic information, in particular to a method, equipment and medium for checking the topology of a surface graph.
Background
In the field of geographic information, it is necessary to acquire a full-coverage surface of different geographic elements (such as buildings, land, rivers, etc.) so as to obtain a surface map, which is a map layer covering the different geographic elements. The existing topology inspection scheme is that the graphics of the full-coverage earth surface are generally integrated, then the outline of the integral element is extracted and converted to obtain a full-filled integral surface element, and the integral surface element is used for cutting the original surface element to obtain the gap and the cavity therein. The method can not judge whether gaps exist among all surface elements in the surface graph or not, so that the judgment has certain limitation and the accuracy of the inspection result is reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, an object of the present invention is to provide a method for checking topology of a landscape graphic, which can solve the problem that the conventional topology checking of the landscape graphic cannot determine whether gaps exist between each surface element in the landscape graphic, so that the determination has certain limitations and the accuracy of the checking result is reduced.
Another objective of the present invention is to provide an electronic device, which can solve the problems that the topology inspection of the traditional earth surface graph cannot determine whether a gap exists between each surface element in the earth surface graph, so that the determination has certain limitations and the accuracy of the inspection result is reduced.
The present invention is also directed to a computer-readable storage medium, which can solve the problems that the conventional topology inspection of a surface map cannot determine whether gaps exist between surface elements of the surface map, so that the determination has certain limitations and the accuracy of the inspection result is reduced.
The fourth objective of the present invention is to provide a computer program product, which can solve the problem that the conventional topology inspection of the surface map cannot determine whether gaps exist between each surface element in the surface map, so that the determination has certain limitations and the accuracy of the inspection result is reduced.
One of the purposes of the invention is realized by adopting the following technical scheme:
a topology inspection method of a surface graph comprises the following steps:
acquiring a ground surface graph, and acquiring a pre-collected ground surface graph, wherein the ground surface graph consists of a plurality of surface elements;
converting line segments, extracting all the outer contour line segments corresponding to each face element according to the end points of the outer contour corresponding to each face element, and obtaining a line segment set containing a plurality of the outer contour line segments;
checking adjacent line segments, judging whether an adjacent outer contour line segment exists between any two surface elements, if so, taking the adjacent outer contour line segment as the adjacent line segment, confirming that a suspected gap exists between the two surface elements corresponding to the adjacent line segment, and executing an angle judgment step, otherwise, judging that the surface graph has no gap;
judging the angle, namely judging whether the included angle between adjacent line segments reaches a preset included angle threshold value, if so, determining that a gap exists between two surface elements corresponding to the adjacent line segments, and if not, determining that no gap exists between the two surface elements corresponding to the adjacent line segments;
and outputting the inspection result, namely taking the two surface elements with the gaps as gap unqualified surface elements, and outputting all the gap unqualified surface elements in the surface graph as unqualified inspection results.
Further, before the checking of the adjacent line segments, whether an acute angle exists is checked, whether an included angle between any two intersected outer contour line segments in each surface element is an acute angle is judged according to prestored endpoint coordinates corresponding to the outer contour line segments, if so, the corresponding surface element is used as an acute angle type unqualified surface element, and if not, the surface element is determined not to belong to an acute angle type unqualified surface element.
Further, the step of obtaining the surface figure further includes obtaining coordinate data corresponding to the surface figure, where the coordinate data is an end point coordinate corresponding to each surface element in the surface figure, and the end point coordinate is an intersection point coordinate of two adjacent outer contour line segments in the same surface element.
Further, the outputting the inspection result further comprises outputting all acute angle unqualified surface elements in the surface graph together as an unqualified inspection result.
Further, the determining whether there is an adjacent outline segment between any two of the surface elements specifically includes: randomly selecting two surface elements from the surface graph, respectively calculating the line segment distance between each outer contour line segment of one surface element and all outer contour line segments in the other surface element, and judging whether the line segment distance is within the preset line segment distance range, if so, an adjacent outer contour line segment exists between the two surface elements, taking the two outer contour line segments with the line segment distance within the preset line segment distance as the adjacent line segment, and if not, no adjacent outer contour line segment exists between the two surface elements.
Further, the distance range of the preset line segment is more than 0cm and less than 0.5 cm.
Furthermore, the method also comprises adjusting the vector direction before the angle judgment, and adjusting the vector directions corresponding to two adjacent outer contour line segments in the same plane element to make the vector directions of the two outer contour line segments consistent.
The second purpose of the invention is realized by adopting the following technical scheme:
an electronic device, comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing a topology inspection method of a terrain map as described herein.
The third purpose of the invention is realized by adopting the following technical scheme:
a computer-readable storage medium, on which a computer program is stored, which is executed by a processor to perform a method of topology inspection of a surface map as described in the present application.
Compared with the prior art, the invention has the beneficial effects that: the utility model provides a topology inspection method of earth's surface figure, through judging arbitrary two whether there is neighbouring outline line segment to select between the face element the neighbouring line segment that two face elements of suspected gap exist in the earth's surface figure correspond, judge whether there is the gap between two face elements according to neighbouring line segment, regard every face element in the earth's surface figure as the object of detection, no longer receive the restriction that the face element in the earth's surface figure symbolizes the rule, refine all gaps that every face element can be accurate in the inspection out the earth's surface figure with the inspection object, make the topology inspection result to the earth's surface figure more accurate.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic flow chart of a topology inspection method for a surface map according to the present invention;
FIG. 2 is a schematic diagram of a transition line segment between a surface element A and a surface element B in the topology inspection method of a surface map according to the present invention;
FIG. 3 is a schematic diagram of the surface element A and the surface element B corresponding to the outer contour in the topology inspection method of a surface map according to the present invention;
FIG. 4 is a schematic diagram of an outer contour segment A3 and an outer contour segment B4 in the topology inspection method of a surface map according to the present invention;
fig. 5 is a schematic diagram illustrating calculation of an included angle between an outer contour line segment a3 and an outer contour line segment B4 in the topology inspection method of a surface map according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
As shown in fig. 1, a method for checking topology of a surface map in the present application includes the following steps:
the method comprises the steps of obtaining a ground surface graph and obtaining a pre-collected ground surface graph, wherein the ground surface graph is composed of a plurality of surface elements. In this embodiment, the step further includes obtaining coordinate data corresponding to the surface figure, where the coordinate data is an endpoint coordinate corresponding to each surface element in the surface figure, and the endpoint coordinate is an intersection coordinate of two adjacent outer contour line segments in the same surface element.
And converting line segments, namely extracting all the outer contour line segments corresponding to each face element according to the end points of the outer contour corresponding to each face element to obtain a line segment set containing a plurality of outer contour line segments. And adjusting the vector direction, and adjusting the vector direction corresponding to two adjacent outer contour line segments in the same plane element to enable the vector directions of the two outer contour line segments to be consistent.
And checking whether an acute angle exists, judging whether an included angle between any two intersected outer contour line segments in each surface element is an acute angle according to prestored endpoint coordinates corresponding to the outer contour line segments, if so, taking the corresponding surface element as an acute angle type unqualified surface element, and if not, determining that the surface element does not belong to the acute angle type unqualified surface element.
And checking adjacent line segments, judging whether an adjacent outer contour line segment exists between any two surface elements, if so, taking the adjacent outer contour line segment as the adjacent line segment, confirming that a gap is suspected to exist between the two surface elements corresponding to the adjacent line segment, executing an angle judgment step, and if not, judging that the surface graph has no gap. The step of judging whether there is an adjacent outline segment between any two of the surface elements specifically includes: randomly selecting two surface elements from the surface graph, respectively calculating the line segment distance between each outer contour line segment of one surface element and all outer contour line segments in the other surface element, and judging whether the line segment distance is within the preset line segment distance range, if so, an adjacent outer contour line segment exists between the two surface elements, taking the two outer contour line segments with the line segment distance within the preset line segment distance as the adjacent line segment, and if not, no adjacent outer contour line segment exists between the two surface elements.
Judging the angle, namely judging whether the included angle between adjacent line segments reaches a preset included angle threshold value, if so, determining that a gap exists between two surface elements corresponding to the adjacent line segments, and if not, determining that no gap exists between the two surface elements corresponding to the adjacent line segments;
and outputting the inspection result, namely taking the two surface elements with the gaps as gap unqualified surface elements, and outputting all the gap unqualified surface elements in the surface graph as unqualified inspection results. In this step, the method further comprises the step of outputting all the acute angle unqualified surface elements in the surface graph together as a unqualified inspection result.
Preferably, in this embodiment, the distance range of the preset line segment is greater than 0cm and less than 0.5cm, the preset angle threshold is preferably 15 °, and the specific value can be set by a worker according to an actual situation.
The following are exemplified: assuming that the surface graph has a surface element A and a surface element B, and extracting an external outline, the whole process is as shown in FIG. 2, wherein the left graph in FIG. 2 is the surface element A, and the right graph is the surface element B; in the step of converting line segments, extracting the outer contour line segments corresponding to the surface element a and the surface element B according to the end points of the outer contour in the surface element a and the surface element B, and obtaining a line segment set as shown in fig. 3, where the line segment set corresponding to the surface element a includes the following outer contour line segments: a1, a2, A3, a4, a5, wherein a1 intersects a2 and a5, respectively, and A3 intersects a2 and a4, respectively; the line segment set corresponding to the surface element B comprises the following outer contour line segments: b1, B2, B3, B4, wherein B1 intersects B2 and B4, respectively, and B3 intersects B2 and B4, respectively, wherein B1 is in a relative position to B3. In this embodiment, the coordinates of the end points corresponding to a1, a2, A3, a4, a5, B1, B2, B3, and B4 can be known in advance.
Further judging whether an adjacent outer contour line segment exists between the surface element A and the surface element B, specifically: calculating the line segment distances from A1 to B1, B2, B3 and B4, the line segment distances from A2 to B1, B2, B3 and B4 and the line segment distances from A3 to B1, B2, B3 and B4 respectively; the line segment distances between a4 to B1, B2, B3, B4; the line segment distances between a5 to B1, B2, B3, B4; the specific calculation method is to calculate the distance between two line segments according to the coordinates of the end points of the line segments, and on the premise that the coordinates of the end points of the line segments are known, calculating the distance between the two line segments is the prior art, and is not described herein again. Here, it is determined whether all the line segment distances belong to a preset line segment distance range. In the present embodiment, the distance between two intersecting line segments is 0 cm; and finally, taking the line segment distance corresponding to the two line segments not belonging to the preset line segment distance range and belonging to 0, and taking all the two outer contour line segments with the line segment distance belonging to 0 as a first combination, as shown in the following table 1:
TABLE 1 first combination Table
| Serial number | Line segment 1 | Line segment 2 |
| 1 | A1 | A2 |
| 2 | A2 | A3 |
| 3 | A3 | A4 |
| 4 | A5 | A1 |
| 5 | B1 | B2 |
| 6 | B2 | B3 |
| 7 | B3 | B4 |
| 8 | B4 | B1 |
And finally, taking the line segment distance corresponding to the two line segments as a preset line segment distance range, and taking all the two outer contour line segments corresponding to the line segment distance as a second combination, as shown in table 2:
TABLE 2 second combination of tables
| Serial number | Line segment 1 | Line segment 2 |
| 1 | A3 | B4 |
From the above calculation, the line segment distance between the outer contour line segment A3 in the surface element a and the outer contour line segment B4 in the surface element B falls within the preset line segment distance range, and therefore the outer contour line segment A3 and the outer contour line segment B4 are taken as the adjacent line segments.
As shown in fig. 4, the coordinates of the two end points of the outer contour segment a3 are (AX1, AY1), (AX2, AY 2); coordinates of two end points of the outer contour line segment B4 are (BX1, BY1), (BX2 and BY 2); calculating the included angle between the outer contour line segment A3 and the outer contour line segment B4 according to the coordinates, and setting the included angle to be theta; the specific calculation method is as follows:
as shown in fig. 5, two end points of an outer contour line segment A3 (denoted as a in the drawing for convenience of drawing) and an outer contour line segment B4 (denoted as B in the drawing for convenience of drawing) are extended and intersected at one point, a plane two-dimensional coordinate system is established BY taking the intersection point of the extension lines as an origin, an included angle between the outer contour line segment A3 and the Y axis is made to be θ 1, and an included angle between the outer contour line segment B4 and the Y axis is made to be θ 2, so that θ 1 is int (atan2((BY1-BY2), (BX1-BX2) × 180/pi)); θ 2 — int (atan2((AY1-AY2), (AX1-AX2) × 180/. pi)). If θ 1 × θ 2>0, i.e., both angles are positive or both negative, then θ ═ abs (θ 1- θ 2); if θ 1 × θ 2 < 0, i.e., one of the two angles is positive and one is negative, then θ is abs (θ 1) + abs (θ 2). And finally, judging whether an included angle theta between the outer contour line segment A3 and the outer contour line segment B4 reaches a preset included angle threshold value, wherein the preset included angle threshold value is preferably 15 degrees, if so, a gap exists between two surface elements corresponding to the adjacent line segment, and if not, a gap does not exist between two surface elements corresponding to the adjacent line segment. After calculation, the line segment distances and angles corresponding to all the outer contour line segments in the first combination are shown in table 3, and the line segment distances and angles corresponding to all the outer contour line segments in the second combination are shown in table 4:
TABLE 3 first group calculation result Table
TABLE 4 first group calculation result Table
| Serial number | Line segment 1 | Line segment 2 | Distance (cm) | Angle (degree) |
| 1 | A3 | B4 | 0.2 | 2 |
As can be seen from table 4, the distance range between the outer contour line segment A3 and the outer contour line segment B4 is smaller than the preset included angle threshold, and therefore a gap exists between the outer contour line segment A3 and the outer contour line segment B4, that is, a gap exists between the surface element a and the surface element B.
The present invention also provides an electronic device comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising instructions for performing a topology inspection method of a terrain map as described herein.
The present invention also provides a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor to perform a method for topology inspection of a surface map as described in the present application.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, implements a method of topology inspection of a surface map as described in the present application.
According to the topology inspection method of the earth surface graph, adjacent line segments corresponding to two surface elements suspected of having gaps in the earth surface graph are screened out by judging whether adjacent outer contour line segments exist between any two surface elements, whether gaps exist between the two surface elements is judged according to the adjacent line segments, each surface element in the earth surface graph is used as an object to be detected and is not limited by the characterization rules of the surface elements in the earth surface graph, the object to be detected is refined to the extent that all the gaps in the earth surface graph can be accurately detected by each surface element, and the topology inspection result of the earth surface graph is more accurate; in the inspection scheme, the composition structure of the surface elements is refined during inspection, actual parameters such as angles and distances of each line combination can be obtained, and whether the line combination is a gap or an unreasonable acute angle can be judged by realizing a set rule.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (9)
1. A topology inspection method of a surface graph is characterized in that: the method comprises the following steps:
acquiring a ground surface graph, and acquiring a pre-collected ground surface graph, wherein the ground surface graph consists of a plurality of surface elements;
converting line segments, extracting all the outer contour line segments corresponding to each face element according to the end points of the outer contour corresponding to each face element, and obtaining a line segment set containing a plurality of the outer contour line segments;
checking adjacent line segments, judging whether an adjacent outer contour line segment exists between any two surface elements, if so, taking the adjacent outer contour line segment as the adjacent line segment, confirming that a suspected gap exists between the two surface elements corresponding to the adjacent line segment, and executing an angle judgment step, otherwise, judging that the surface graph has no gap;
judging the angle, namely judging whether the included angle between adjacent line segments reaches a preset included angle threshold value, if so, determining that a gap exists between two surface elements corresponding to the adjacent line segments, and if not, determining that no gap exists between the two surface elements corresponding to the adjacent line segments;
and outputting the inspection result, namely taking the two surface elements with the gaps as gap unqualified surface elements, and outputting all the gap unqualified surface elements in the surface graph as unqualified inspection results.
2. The topology inspection method of a terrain map of claim 1, wherein: and before the adjacent line segments are inspected, whether an acute angle exists is also inspected, whether the included angle between any two intersected outer contour line segments in each surface element is an acute angle is judged according to the prestored endpoint coordinates corresponding to the outer contour line segments, if so, the corresponding surface element is taken as an acute angle type unqualified surface element, and if not, the surface element is determined not to belong to an acute angle type unqualified surface element.
3. The topology inspection method of a terrain map of claim 2, characterized in that: the step of obtaining the surface figure further comprises the step of obtaining coordinate data corresponding to the surface figure, wherein the coordinate data are end point coordinates corresponding to each surface element in the surface figure, and the end point coordinates are intersection point coordinates of two adjacent outer contour line segments in the same surface element.
4. The topology inspection method of a terrain map of claim 2, characterized in that: the outputting the inspection result further comprises outputting all acute angle unqualified surface elements in the surface graph together as an unqualified inspection result.
5. The topology inspection method of a terrain map of claim 1, wherein: the specific step of judging whether an adjacent outer contour line segment exists between any two of the surface elements is as follows: randomly selecting two surface elements from the surface graph, respectively calculating the line segment distance between each outer contour line segment of one surface element and all outer contour line segments in the other surface element, and judging whether the line segment distance is within the preset line segment distance range, if so, an adjacent outer contour line segment exists between the two surface elements, taking the two outer contour line segments with the line segment distance within the preset line segment distance as the adjacent line segment, and if not, no adjacent outer contour line segment exists between the two surface elements.
6. The topology inspection method of a terrain map of claim 5, wherein: the distance range of the preset line segments is more than 0cm and less than 0.5 cm.
7. The topology inspection method of a terrain map of claim 1, wherein: and adjusting the vector direction before the angle judgment, and adjusting the vector directions corresponding to two adjacent outer contour line segments in the same plane element to enable the vector directions of the two outer contour line segments to be consistent.
8. An electronic device, characterized by comprising: a processor;
a memory; and a program, wherein the program is stored in the memory and configured to be executed by the processor, the program comprising a topology checking method for performing a terrain map of any of claims 1-7.
9. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program is executed by a processor to perform a method of topology inspection of a terrain map as claimed in any one of claims 1 to 7.
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