CN113592977B - Linear ground object processing method, system, memory and device in urban area demarcation - Google Patents
Linear ground object processing method, system, memory and device in urban area demarcation Download PDFInfo
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Abstract
The application discloses a linear ground object processing method, a system, a memory and a device in urban area range demarcation, wherein the method comprises the following steps: s1, extracting a first physical region layer and a first linear ground object layer from map data of a defined physical region; s2, generating an entity buffer region; extracting linear ground objects intersecting with the entity buffer region in the first linear ground object layer to generate a second linear ground object layer; generating a region folding point layer; s3, extracting a datum line of the linear ground object and dividing the datum line to obtain a datum line segment; s4, determining a reference line segment matched with each break point in the region break point layer; s5, determining the foot drop of the folding point on the end line segment; dividing the end line segment into sub-line segments; and deleting the linear ground object corresponding to the terminal sub-line segment. The application has the advantage of automatically and efficiently processing the linear ground objects.
Description
Technical Field
The application relates to the technical field of homeland space planning, in particular to a linear ground object processing method, system and storage medium in urban area demarcation.
Background
In geographic data processing software (such as arcGIS, mapGIS, etc.) for planning a homeland space, a "real world phenomenon" is defined as an element displayed on a map, for example, a house is represented as a rectangle on the map, and the rectangle is an element. The elements are classified into dot elements, linear elements, and plane elements. The dot-like element is an element expressed by a dot, and only the position coordinates have no length or area, for example, a street lamp is expressed as a dot on a map. The linear elements are elements represented by line segments, have position coordinates and lengths, and have no area, for example, administrative boundaries are represented by lines. The planar element is an element expressed by one plane, and has position coordinates, length and area, and the rectangle as described above represents a house. Although the linear element also includes points (for example, the administrative division lines are connected by a plurality of boundary points (pegs), the inside of the linear element stores points by which a certain line is connected and coordinates of the points), the planar element includes points and lines, but the points in the linear element are stored as a whole of the linear element, and the points and lines in the planar element are stored as a whole of the planar element. In the geographic data processing software, a set composed of elements of the same type is stored and processed in a layer mode. In arcgis, mapGIS or other geographic data processing software, a layer is a separate file.
In urban area demarcation of the homeland space planning, according to the urban area ranging determination procedure (TD/T1064-2021) issued by the natural resource department 2021, 6 and 18, the characteristic features of the line ends such as roads and ditches extending beyond the physical region of the centralized continuous planar urban area need to be cut off and deleted in the geographic information system, and only the part in the physical region of the current urban area is reserved. In the actual urban area demarcation process, according to the prior investigation condition and basic data processing, the range and types of different types of ground features (such as houses, roads, channels, rivers, parks and the like) are marked in geographic data processing software (such as arcGIS, mapGIS and the like). The non-linear ground object is marked as a physical region belonging to an urban area, and the linear ground object (such as a road, a canal, a river and the like) has linear characteristics, so that the linear ground object has a large extension range, and the linear ground object can be brought into the physical region range of the urban area after being cut off and deleted. As shown in fig. 1, the gray solid portion represents the delimited solid region, and the hatched portion represents the line-shaped ground object to be processed (fig. 1 is a road), and for this line-shaped ground object, it is necessary to cut off the line-shaped ground object according to the situation of the delimited solid region, delete the portion at least partially located outside the buffer range of which the delimited solid region is a certain distance, and then bring the remaining line-shaped ground object into the solid region, thereby obtaining the urban area as shown in fig. 2.
Before that, no corresponding technical guide and processing standard are adopted, and at present, in order to meet the processing requirement of the standard, a human judgment and processing mode is adopted, namely, the cutting point of the linear ground object is manually determined through geographic data processing software, the linear ground object is cut off and deleted, and the reserved linear ground object is brought into the physical region range of the urban area range, so that the processing workload is high, the efficiency is low, and research on the method is needed, and an efficient automatic processing method is provided.
Disclosure of Invention
The technical problem to be solved by the application is as follows: aiming at the technical problems existing in the prior art, the application provides a high-efficiency linear ground object processing method, system, memory and device in urban area demarcation.
In order to solve the technical problems, the technical scheme provided by the application is as follows: a linear ground object treatment method in urban area demarcation comprises the following steps:
s1, extracting linear ground objects from map data of a defined physical region to generate a first linear ground object layer, and extracting the physical region to generate a first physical region layer;
s2, buffering the first entity region layer according to a preset distance to generate an entity buffering region; extracting linear ground objects intersecting the entity buffer region in the first linear ground object layer to generate a second linear ground object layer; extracting coordinates of folding points of the physical region in the first physical region layer to generate a region folding point layer;
s3, extracting a datum line of the linear ground object in the second linear ground object layer, and dividing the datum line at a folding point to obtain a datum line segment;
s4, for each break point in the region break point layer, determining the reference line segment matched with the break point according to the shortest path;
s5, determining an end line segment from the reference line segment, and determining the foot drop of the folding point on the end line segment according to the matching relation between the folding point and the reference line segment; dividing the end line segment into sub line segments by taking the drop foot as a dividing point; and deleting the linear ground object corresponding to the terminal sub-line segment.
Further, the step S1 further includes: fusing the first linear ground object layer; and fusing the first entity region layers.
Further, the datum line is the center line of the linear ground feature.
Further, the end line segment is a reference line segment with at least one endpoint being an isolated endpoint; the terminal sub-line segment is a sub-line segment with at least one endpoint being an isolated endpoint.
A linear ground object processing system for demarcating urban areas comprises a first module, a second module and a third module, wherein the first module is used for extracting linear ground objects from map data of a demarcated entity region to generate a first linear ground object layer, and extracting the entity region to generate a first entity region layer;
the second module is used for buffering the first entity region layer according to a preset distance to generate an entity buffer region; extracting linear ground objects intersecting the entity buffer region in the first linear ground object layer to generate a second linear ground object layer; extracting coordinates of folding points of the physical region in the first physical region layer to generate a region folding point layer;
the third module is used for extracting a datum line of the linear ground object in the second linear ground object layer and dividing the datum line at a folding point to obtain a datum line segment;
a fourth module, configured to determine, for each break point in the regional break point layer, the reference line segment that matches the shortest path;
a fifth module, configured to determine an end line segment from the reference line segments, and determine a foot drop of the break point on the end line segment according to a matching relationship between the break point and the reference line segment; dividing the end line segment into sub line segments by taking the drop foot as a dividing point; and deleting the linear ground object corresponding to the terminal sub-line segment.
Further, the first module is further configured to: fusing the first linear ground object layer; and fusing the first entity region layers.
Further, the datum line is the center line of the linear ground feature.
Further, the end line segment is a reference line segment with at least one endpoint being an isolated endpoint; the terminal sub-line segment is a sub-line segment with at least one endpoint being an isolated endpoint.
A memory in which a computer program is stored which, when executed, enables the method for processing linear features in urban area demarcation according to any one of the preceding claims.
An apparatus comprising a processor and a memory, the processor being for executing a computer program stored in the memory, the memory being a memory as described above.
Compared with the prior art, the application has the advantages that: the application expands the range of the physical region by extracting the physical region and the linear ground object, eliminates a large number of unrelated linear ground objects from the linear ground object by judging whether the linear ground objects intersect or not, determines the vertical feet of the folding points on the linear ground object according to the shortest path principle by the folding points of the physical region, divides the linear ground object according to the vertical feet, and deletes the end ground object at least partially positioned outside the range of the physical region according to the division result, thereby being capable of rapidly and efficiently generating the terminal ground object which meets the requirements of the urban region determining rule (TD/T1064-2021), deleting the part outside the range of the physical region and reserving the part in the range of the physical region.
Drawings
Fig. 1 is a schematic diagram of a map to be processed in an embodiment of the present application.
Fig. 2 is a schematic diagram of a map after processing in an embodiment of the present application.
FIG. 3 is a flow chart of an embodiment of the present application.
Fig. 4 is a schematic diagram of shortest path matching and splitting in accordance with an embodiment of the present application.
Detailed Description
The application is further described below in connection with the drawings and the specific preferred embodiments, but the scope of protection of the application is not limited thereby.
The linear ground object treatment method in urban area demarcation of the embodiment comprises the following steps: s1, extracting linear ground objects from map data of a defined physical region to generate a first linear ground object layer, and extracting the physical region to generate a first physical region layer; s2, buffering the first entity region layer according to a preset distance to generate an entity buffer region; extracting linear ground objects intersecting with the entity buffer region in the first linear ground object layer to generate a second linear ground object layer; extracting coordinates of folding points of the physical region in the first physical region layer to generate a region folding point layer; s3, extracting a datum line of the linear ground object in the second linear ground object layer, and dividing the datum line at the folding point to obtain a datum line segment; s4, for each break point in the region break point layer, determining a reference line segment matched with the break point according to the shortest path; s5, determining an end line segment from the reference line segment, and determining the drop foot of the folding point on the end line segment according to the matching relation between the folding point and the reference line segment; dividing the end line segment into sub-line segments by taking the drop foot as a dividing point; and delete the linear ground object corresponding to the terminal line segment.
In this embodiment, step S1 further includes: fusing the first linear ground object layer; and fusing the first entity region layers. The datum line is the center line of the linear ground object. The end line segment is a reference line segment with at least one endpoint being an isolated endpoint; the terminal sub-line segment is a sub-line segment with at least one endpoint being an isolated endpoint.
In this embodiment, the technical solution of the present application will be described in detail with reference to the accompanying drawings. In the map data of the delimited physical region of the present embodiment, as shown in fig. 1, the gray shaded portion is the delimited physical region (the physical region is the region corresponding to the ground object which has been brought into the urban area), and the black shaded portion is the delimited linear ground object (the road in fig. 1), and it should be noted that the linear ground object may be a river, a ditch, or the like. According to the specification of the urban area range determination procedure (TD/T1064-2021), the technical scheme of the embodiment is to cut off and delete linear features which are not included in the urban area range, so that the linear feature range which remains after deletion can be included in the urban area range.
In this embodiment, as shown in fig. 3, the physical region and the linear ground feature are extracted from the map data shown in fig. 1, wherein the layer of the physical region is denoted by M layers, and the layer of the linear ground feature is denoted by L layers. And then fusing the M layers to obtain an M1 layer (namely a first physical region layer), and fusing the L layers to obtain an L1 layer (a first linear ground object layer). The fusion can be completed by a self-contained tool capable of calling geographic data processing software, a plurality of elements of the same type in the same layer can be fused into one element through fusion, for example, an entity region M layer comprises a building, the building comprises 1 unit, 2 units and 3 units, the 3 units are all independent planar elements, the M layer comprises 3 planar elements before fusion, and the fusion is to fuse the 3 planar elements into 1 planar element, so that only the external shape of a house is reserved, and the independent units are not distinguished. Similarly, the L layer of the linear ground object may include a plurality of roads, or may include roads, trenches, or the like, each of which corresponds to one planar element, and these planar elements may be fused into one planar element by fusion. Through fusion, not only can effective information in the layers be reserved, but also the quantity of invalid data in the layers can be reduced, so that the processing in the subsequent steps is more efficient.
In this embodiment, buffering the M1 layer physical region may be accomplished by calling a self-contained tool of the geographic data processing software, where the buffering is to amplify the elements of the layer by a certain distance, for example, a square planar element with a side length of 100 meters, and buffering by 10 meters, then becomes a square planar element with a side length of 120 meters. After the physical domain is amplified through buffering, whether the amplified physical domain is intersected with the linear ground object or not is judged, and the intersected physical ground object is extracted and marked as an L2 layer (namely a second linear ground object layer). And extracting the break point coordinates of the physical region of the M1 layer, and marking the break point coordinates as the PM1 layer (namely the region break point layer).
In this embodiment, the reference line of the linear feature is extracted from the linear feature in the L2 layer, and the reference line is preferably the center line of the linear feature and is denoted as the L3 layer. And dividing the datum line into datum line segments according to the break points in the L3 layer, wherein each datum line segment is a straight line segment and is marked as the L4 layer.
In this embodiment, for each geographical folding point in the PM1 layer, a shortest path tool in the geographical data processing software is called to find out a reference line segment having a shortest path with the geographical folding point, and a matching relationship between the two is established. When the shortest paths between the same region folding point and two or more than two reference line segments are the same, the matching relationship between the region folding point and each reference line segment can be respectively established. In this embodiment, the shortest path is a perpendicular line segment between the region folding point and the reference line segment, or a line between the region folding point and the nearest endpoint of the reference line segment. As shown in fig. 4, there are reference line segments x1 (with endpoints a1 and a 2), x2 (with endpoints a2 and a 3), x3 (with endpoints a3 and a 4), and region folding points p1, p2, p3 and p4, wherein the region surrounded by the 4 region folding points is a physical region, and the physical buffer region corresponding to the physical region is a portion surrounded by a dashed line in the figure. In fig. 4, the perpendicular line between the point p1 and the reference line segment x2 is not perpendicular to the reference line segment x2, and the perpendicular line between the point p1 and the reference line segment x3 is not perpendicular to the reference line segment x3, the connecting line between the point p1 and the point a3 is the shortest path between the point p1 and the reference line segment x2, and is also the shortest path between the point p1 and the reference line segment x 3. The reference line segment with the shortest path matching point p2 is x2, and its shortest path is the line connecting p2 and d 2. Similarly, the reference line segments with the shortest paths that match points p3 and p4 can be determined to be x1, with the foot drop points d3 and d4, respectively.
In this embodiment, an end line segment is determined from the reference line segments, where the end line segment is a reference line segment having at least one endpoint that is an isolated endpoint; the terminal sub-line segment is a sub-line segment with at least one endpoint being an isolated endpoint. An isolated endpoint is that the endpoint belongs to only one reference line segment or sub-line segment, and the endpoint which is not shared with other reference line segments or sub-line segments is shown in fig. 4, in the reference line segments x1 (the endpoints are a1 and a 2), x2 (the endpoints are a2 and a 3), x3 (the endpoints are a3 and a 4), the endpoint a1 and the endpoint a4 are not shared with other reference line segments, and the reference line segments x1 and x3 are end line segments, and the endpoint a2 is shared by the reference line segments x1 and x2 respectively, and the endpoint a3 is shared by the reference line segments x2 and x3 respectively, so the reference line segment x2 is not an end line segment. After the end line segment is determined, determining the drop foot of the region folding point on the reference line segment according to the matching relation between the region folding point and the reference line segment, and dividing the reference line segment into sub line segments by the drop foot. As shown in fig. 4, the end segment x1 is divided by the feet d3 and d4 twice, and three sub-segments a1-d3, d3-d4 and d4-a2 are obtained after division, wherein the end point a1 is an isolated end point, that is, the sub-segments a1-d3 are end sub-segments, and the linear ground object part corresponding to the end sub-segments a1-d3 is deleted. When the end line segment is not segmented by the drop foot, the end line segment is the end sub line segment. For the other end segment x3 in fig. 4, since the perpendicular line is drawn to the end segment x3 through the break point p1 corresponding thereto, the foot d1 thereof is not located above the end segment x3, and therefore, the end segment x3 is not segmented by the foot, and then the end segment x3 constitutes the end sub-segment in the present embodiment, and therefore, the linear ground feature corresponding to the end segment x3 is deleted. Through the processing, the linear ground object meeting the requirements of urban area range determination regulations can be obtained. For map data as shown in fig. 1, the result of the processing is shown in fig. 2.
Through the technical scheme of the embodiment, the cutting-off points of the linear ground objects can be automatically and efficiently determined and cut off in urban area range demarcation, and the parts which do not meet the requirements are deleted, so that the linear ground objects which should be reserved are obtained, and the processing speed and the processing efficiency of the linear ground objects are greatly improved.
Corresponding to the technical scheme, the urban area range demarcation linear feature processing system of the embodiment comprises a first module, a second module and a third module, wherein the first module is used for extracting linear features from map data of the demarcated physical region to generate a first linear feature layer, and extracting the physical region to generate a first physical region layer;
the second module is used for buffering the first entity region layer according to a preset distance to generate an entity buffer region; extracting linear ground objects intersecting with the entity buffer region in the first linear ground object layer to generate a second linear ground object layer; extracting coordinates of folding points of the physical region in the first physical region layer to generate a region folding point layer;
the third module is used for extracting the datum line of the linear ground object in the second linear ground object layer and dividing the datum line at the folding point to obtain a datum line segment;
a fourth module, configured to determine, for each break point in the regional break point layer, a reference line segment matched with the shortest path;
a fifth module, configured to determine an end line segment from the reference line segments, and determine a drop foot of the break point on the end line segment according to a matching relationship between the break point and the reference line segment; dividing the end line segment into sub-line segments by taking the drop foot as a dividing point; and delete the linear ground object corresponding to the terminal line segment.
In this embodiment, the first module is further configured to: fusing the first linear ground object layer; and fusing the first entity region layers. The datum line is the center line of the linear ground object. The end line segment is a reference line segment with at least one endpoint being an isolated endpoint; the terminal sub-line segment is a sub-line segment with at least one endpoint being an isolated endpoint.
The memory of this embodiment stores a computer program that, when executed, can implement the linear feature processing method in urban area demarcation as described in any one of the above.
The apparatus of this embodiment includes a processor and a memory, where the processor is configured to execute a computer program stored in the memory, and the memory is a memory as described above.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application in any way. While the application has been described with reference to preferred embodiments, it is not intended to be limiting. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application shall fall within the scope of the technical solution of the present application.
Claims (6)
1. A linear ground object treatment method in urban area demarcation is characterized by comprising the following steps:
s1, extracting linear ground objects from map data of a defined physical region to generate a first linear ground object layer, and extracting the physical region to generate a first physical region layer;
s2, buffering the first entity region layer according to a preset distance to generate an entity buffering region; extracting linear ground objects intersecting the entity buffer region in the first linear ground object layer to generate a second linear ground object layer; extracting coordinates of folding points of the physical region in the first physical region layer to generate a region folding point layer;
s3, extracting a datum line of the linear ground object in the second linear ground object layer, and dividing the datum line at a folding point to obtain a datum line segment;
s4, for each break point in the region break point layer, determining the reference line segment matched with the break point according to the shortest path;
s5, determining an end line segment from the reference line segment, and determining the foot drop of the folding point on the end line segment according to the matching relation between the folding point and the reference line segment; dividing the end line segment into sub line segments by taking the drop foot as a dividing point; deleting the linear ground object corresponding to the terminal sub-line segment;
the datum line is the central line of the linear ground object;
the end line segment is a reference line segment with at least one endpoint being an isolated endpoint; the terminal sub-line segment is a sub-line segment with at least one endpoint being an isolated endpoint.
2. The method for processing linear ground objects in urban area demarcation according to claim 1, characterized by: the step S1 further includes: fusing the first linear ground object layer; and fusing the first entity region layers.
3. A linear ground object processing system is delimited to urban area scope which characterized in that: the map data processing system comprises a first module, a second module and a third module, wherein the first module is used for extracting linear ground objects from map data of a defined physical region to generate a first linear ground object layer, and extracting the physical region to generate a first physical region layer;
the second module is used for buffering the first entity region layer according to a preset distance to generate an entity buffer region; extracting linear ground objects intersecting the entity buffer region in the first linear ground object layer to generate a second linear ground object layer; extracting coordinates of folding points of the physical region in the first physical region layer to generate a region folding point layer;
the third module is used for extracting a datum line of the linear ground object in the second linear ground object layer and dividing the datum line at a folding point to obtain a datum line segment;
a fourth module, configured to determine, for each break point in the regional break point layer, the reference line segment that matches the shortest path;
a fifth module, configured to determine an end line segment from the reference line segments, and determine a foot drop of the break point on the end line segment according to a matching relationship between the break point and the reference line segment; dividing the end line segment into sub line segments by taking the drop foot as a dividing point; deleting the linear ground object corresponding to the terminal sub-line segment;
the datum line is the central line of the linear ground object;
the end line segment is a reference line segment with at least one endpoint being an isolated endpoint; the terminal sub-line segment is a sub-line segment with at least one endpoint being an isolated endpoint.
4. A urban scoping line feature handling system according to claim 3, wherein: the first module is further configured to: fusing the first linear ground object layer; and fusing the first entity region layers.
5. A memory, characterized in that: the memory stores a computer program which, when executed, implements the method for processing linear ground objects in urban area demarcation according to claim 1 or 2.
6. An apparatus, characterized in that: comprising a processor for executing a computer program stored in a memory, the memory being as claimed in claim 5.
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