CN113190639B - Comprehensive drawing method for residential area - Google Patents
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Abstract
The invention discloses a comprehensive residential area drawing method, which comprises the following steps: first, a vector contour of a residential area is acquired using a conventional technique. Then, based on the threshold value to be integrated, each vector edge in the vector outline is traversed, and the edge to be integrated which needs to be integrated in the vector outline is determined. And then, carrying out vector grouping on all vector edges included by each edge to be synthesized according to a set grouping rule, and calculating the sum vector of the grouped vector edges to obtain a grouping vector corresponding to each edge to be synthesized. And finally, replacing the original edge to be synthesized with the optimal recombination edge to obtain the integrated contour of the residential area. The comprehensive concave-convex structure template is not required to be predefined for synthesis, compared with the original vector outline, the comprehensive residential area outline reduces the nodes of the residential area, the area change is small, and the comprehensive effect is good.
Description
Technical Field
The invention relates to the technical field of drawing synthesis, in particular to a residential area drawing synthesis method.
Background
The expression precision of elements under different scales and the bearing capacity of data are different, and drawing synthesis is needed when data are converted from large-scale data to small-scale data. The residential area element is an important element and is always the key point of comprehensive drawing attention. The basic objective of residential area integration is to identify and process small asperities while keeping the polygonal body of the residential area unchanged, while keeping the area variations as small as possible. In the prior art, a part of typical concave-convex structure templates are generally defined in advance, the concave-convex structure of a comprehensive residential area is identified and compared, comprehensive treatment is carried out according to the identified concave-convex structure templates, and a better treatment effect is achieved on simpler residential areas. However, for a complicated residential area, because the structure of the edge to be synthesized is complicated, the defined concave-convex structure template is difficult to meet the matching of the complicated structure, and the comprehensive effect is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a comprehensive residential area mapping method, which can identify the edges to be synthesized in the vector outline of the residential area through a set comprehensive threshold value, and replace the edges to be synthesized by determining the optimal recombination edges corresponding to the edges to be synthesized, thereby obtaining the comprehensive residential area.
The specific technical scheme is as follows:
in a first implementable manner, a residential map synthesis method comprising:
acquiring a vector outline of a residential area and determining a threshold value to be integrated;
traversing each vector edge in the vector outline, determining an initial edge to be synthesized according to a threshold value to be synthesized, and classifying the determined initial edge to be synthesized to obtain a corresponding edge to be synthesized;
vector recombination is carried out on each edge to be synthesized, and the recombined vectors are subjected to grouping summation according to a grouping rule to obtain a grouping vector corresponding to each edge to be synthesized;
determining the optimal recombination edge of each edge to be synthesized according to the corresponding grouping vector;
and replacing the original edge to be synthesized with the corresponding optimal restructuring edge to obtain the synthesized contour of the residential area.
With reference to the first implementable manner, in a second implementable manner, the threshold to be synthesized is a side length.
With reference to the second implementable manner, in a third implementable manner, the traversing each vector edge in the vector outline, and determining an initial edge to be synthesized according to a threshold to be synthesized includes:
traversing each vector edge in the vector outline, and determining the side length of each vector edge;
determining a vector edge with the side length smaller than a threshold value to be integrated to obtain a vector edge to be integrated;
and combining adjacent vector edges to be synthesized into the initial edge to be synthesized.
With reference to the first implementation manner, in a fourth implementation manner, the classifying the initial edge to be synthesized includes:
traversing each initial edge to be integrated, and determining the type of the initial edge to be integrated through a classification standard;
and respectively processing the different types of initial edges to be integrated by adopting corresponding processing methods to obtain corresponding edges to be integrated.
With reference to the fourth implementable manner, in a fifth implementable manner, the classification criterion is:
With reference to the fifth implementable manner, in a sixth implementable manner, the method for processing the simple side includes: and obtaining a previous vector edge and a next vector edge of the initial edge to be synthesized to form the edge to be synthesized.
With reference to the fifth implementation manner, in a seventh implementation manner, the method for processing the complex edge includes:
adding the vector sides to be integrated in the complex sides into corresponding vector side groups to be integrated one by one according to the order of the sides until the vector sum side length of one vector side group to be integrated is more than 2 times of a threshold value to be integrated or the vector sum side lengths of all the vector side groups to be integrated are more than the threshold value to be integrated;
and combining all the vector edges to be integrated added into each vector edge group to be integrated into the edge to be integrated.
With reference to the first implementable manner, in an eighth implementable manner, the following method is adopted to perform vector grouping on the edges to be synthesized:
carrying out vector translation on the vector edges of the edges to be synthesized so as to translate starting points of all the vector edges forming the edges to be synthesized to the same node;
and grouping all the translated vector edges according to a set grouping rule.
With reference to the eighth implementable manner, in a ninth implementable manner, the grouping rule is: the angle between two vector edges satisfies | alpha 1 -α 2 < theta or | alpha 1 -α 2 If-pi | is less than theta, the two vector edges are divided into the same group, wherein alpha is 1 、α 2 The azimuth angles of the two vector edges are respectively, and theta is a preset angle threshold value.
With reference to the first implementable manner, in a tenth implementable manner, the following method is used to determine the optimal restructuring edge corresponding to the edge to be synthesized:
combining all the grouping vectors corresponding to the edges to be synthesized according to different combination sequences to obtain different recombined edges;
respectively replacing the edges to be synthesized by using different recombination edges to obtain corresponding replacement polygons;
calculating the areas of all the replacement polygons;
and comparing the areas of the different replacement polygons with the area of the vector outline before replacement, and selecting the recombination edge corresponding to the replacement polygon with the smallest area change as the optimal recombination edge.
Has the advantages that: by adopting the residential area mapping comprehensive method, the edges to be synthesized in the residential area vector outline are determined through the given comprehensive threshold value, the grouping vectors are obtained by adopting the vector grouping mode for the edges to be synthesized, the grouping vectors are combined into the recombination edges, the optimal recombination edges are obtained under the given optimization rule, and the edges to be synthesized are replaced by the optimal recombination edges to obtain the comprehensive residential area. The synthesis can be carried out without predefining a concave-convex structure template.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
FIG. 1 is a flow chart of an integrated method provided by an embodiment of the present invention;
FIG. 2 is a flowchart illustrating determining edges to be synthesized according to an embodiment of the present invention;
fig. 3 is a flowchart for calculating a grouping vector corresponding to an edge to be synthesized according to an embodiment of the present invention;
fig. 4 is a flowchart of determining an optimal restructuring edge corresponding to an edge to be synthesized according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an edge to be integrated determined using the integration method of the present invention;
FIG. 6 is a schematic view of the vector edges forming the edge to be synthesized 3 in FIG. 5;
FIG. 7 is a diagram illustrating the vector edge recombination result of the edge 3 to be synthesized;
FIG. 8 is a diagram illustrating a grouping vector corresponding to an edge 3 to be synthesized;
FIG. 9 is a diagram illustrating an alternative polygon resulting from the replacement of the grouping vector in FIG. 8;
fig. 10 is a schematic view of the contour of a residential area after being integrated by the integration method of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
A flow chart of a residential map synthesis method as shown in fig. 1, the synthesis method comprising:
and 5, replacing the original edge to be synthesized with the corresponding optimal restructured edge to obtain the comprehensive residential area contour.
Specifically, first, a vector profile of a residential area, such as a remote sensing image, may be obtained by using the existing technology, and the threshold to be integrated may be manually set according to the actual measurement condition of the residential area. Then, each vector edge in the vector outline can be traversed based on the threshold value to be synthesized, so as to determine the edge to be synthesized in the vector outline, which needs to be synthesized. Then, vector grouping can be performed on all the vector edges included in each obtained edge to be synthesized according to a set grouping rule, and a sum vector of the grouped vector edges is calculated to obtain a grouping vector corresponding to each edge to be synthesized. Then, the optimal recombination edge can be selected from all the grouping vectors corresponding to each edge to be synthesized, and finally, the original edge to be synthesized is replaced by the optimal recombination edge, so that the outline of the integrated residential area is obtained. Therefore, the complex contour of the residential area can be integrated without predefining a concave-convex structure template.
In this embodiment, preferably, to determine the edges to be combined, first, each of the vector edges may be compared with the threshold to be combined, and the vector edges smaller than the threshold to be combined are determined to be combined into the initial edge to be combined. In this embodiment, the threshold to be integrated may be a side length of a vector side, and the specific step of determining the initial side to be integrated is shown in fig. 2, and includes:
step 2-1-1, traversing each vector edge in the vector outline, and determining the side length of each vector edge;
step 2-1-2, determining a vector edge with the side length smaller than a threshold value to be integrated to obtain a vector edge to be integrated;
and 2-1-3, combining adjacent vector edges to be integrated into the initial edge to be integrated.
Then, the classification processing may be performed on the initial edge to be integrated, which specifically includes:
step 2-2-1, traversing each initial edge to be integrated, and determining the type of the initial edge to be integrated through a classification standard;
and 2-2-2, respectively processing the different types of initial edges to be integrated by adopting corresponding processing methods to obtain corresponding edges to be integrated.
In this embodiment, preferably, the classification criteria are:
In this embodiment, preferably, the method for processing the simple side includes: and acquiring a previous vector edge and a next vector edge of the initial edge to be integrated to form the edge to be integrated. Specifically, when the initial edge to be synthesized has only one vector edge or two vector edges, a new recombined edge cannot be obtained after vector recombination, and a new edge to be synthesized that is composed of a previous vector edge and a next vector edge of the initial edge to be synthesized can be obtained, and the new initial edge to be synthesized includes three or four vector edges, which are edges to be synthesized for vector recombination to obtain a new recombined edge.
The complex edge has a longer length or a larger number of edges, and after the complex edge is directly processed by adopting a vector recombination mode, the area change after final synthesis is possibly larger, and the synthesis result is unreasonable. In order to solve the problem of large area change, the complex edge to be synthesized can be processed progressively according to a certain rule. In this embodiment, preferably, the method for processing the complex edge includes:
adding the vector sides to be integrated in the complex sides into corresponding vector side groups to be integrated one by one according to the order of the sides until the vector sum side length of one vector side group to be integrated is more than 2 times of a threshold value to be integrated or the vector sum side lengths of all the vector side groups to be integrated are more than an integrated threshold value;
and combining all the vector edges to be integrated added into each vector edge group to be integrated into the edge to be integrated.
Specifically, first, starting from a first to-be-integrated vector side of the complex side, sequentially classifying each to-be-integrated vector side into a corresponding to-be-integrated vector side group according to a grouping rule according to a connection sequence of each to-be-integrated vector in the complex side, calculating a vector sum of each to-be-integrated vector side group after each to-be-integrated vector side is added into the to-be-integrated vector side group, then comparing the vector sum of each to-be-integrated vector side group with a to-be-integrated threshold, and if the vector sum of one to-be-integrated vector side group is greater than 2 times of the to-be-integrated threshold, or if the vector sums of all to-be-integrated vector side groups are greater than the to-be-integrated threshold, stopping grouping the remaining to-be-integrated vector sides of the complex side. And finally, all the edges of the vectors to be synthesized in each edge group of the vectors to be synthesized are extracted and combined into the edge to be synthesized corresponding to the complex edge.
The edges to be integrated obtained by the method are distributed as shown in fig. 5, and 8 groups of edges to be integrated are obtained in total, wherein the edges to be integrated 1, the edges to be integrated 2 and the edges to be integrated 4 are all composed of 1 vector edge, the edges to be integrated 6 are composed of 2 vector edges, the edges to be integrated 5 and the edges to be integrated 7 are all composed of 3 vector edges, and the edges to be integrated 3 and the edges to be integrated 8 are all composed of 7 vector edges.
After determining all edges to be synthesized of the building vector outline, each edge to be synthesized may be processed by the following method, as shown in fig. 3, including:
step 3-1, carrying out vector translation on the vector edges of the edges to be synthesized so as to translate starting points of all the vector edges forming the edges to be synthesized to the same node;
step 3-2, grouping all the translated vector edges according to a set grouping rule;
and 3-3, summing the grouped vector edges to obtain a grouping vector corresponding to the edge to be synthesized.
Specifically, when processing the edge to be integrated 3 shown in fig. 6, first, vector translation may be performed on the vector edges that will constitute the edge to be integrated 3, and the starting points of all the vector edges of the edge to be integrated 3 are translated to the same node O, so as to obtain a recombined vector edge, and the recombination result is shown in fig. 7.
Then, the vector edges in fig. 7 are grouped according to a set grouping rule to obtain different vector edge groups. In the present embodiment, the grouping rule is set to: between two vector edges, | alpha is satisfied 1 -α 2 < theta or alpha 1 -α 2 If-pi | is less than theta, the two vector edges are divided into the same group, wherein alpha is 1 、α 2 The azimuth angles of the two vector sides are respectively, θ is a preset angle threshold, in this embodiment, the angle threshold θ may be set to pi/24, and the result obtained after grouping the vector sides in the figure is:
and finally, summing the grouped vector edge groups by using a vector algorithm to obtain a grouping vector corresponding to the edge to be synthesized. Wherein the first group of packet vectors is
The second group of packet vectors is
The results obtained are shown in FIG. 8.
In this embodiment, preferably, as shown in fig. 4, the following method is adopted to determine the optimal restructuring edge corresponding to the edge to be synthesized:
step 4-1, combining all the grouping vectors corresponding to the edges to be synthesized according to different combination sequences to obtain different recombined edges;
4-2, respectively replacing the edges to be synthesized by using different recombination edges to obtain corresponding replacement polygons;
4-3, calculating the areas of all the replacement polygons;
and 4-4, comparing the areas of the different replacement polygons with the area of the vector outline before replacement, and selecting the recombination side corresponding to the replacement polygon with the minimum area change as the optimal recombination side.
Specifically, first, a packet vector may be encoded
And a packet vector
Constructing recombination edges according to the sequence of the starting point and the end point to obtain two recombination edges which are recombination edges respectively
And restructuring the edges
Then, the recombined edges can be utilized
And recombining edges
The original edges 3 to be synthesized are respectively replaced to obtain two edges as shown in figure 9Replacing the polygon. Then, the areas of the two replacement polygons can be calculated by adopting the existing calculation method, finally, the areas of the two replacement polygons are compared with the area of the polygon corresponding to the vector outline before replacement, the replacement polygon with the smallest area change after replacement is selected out, and the recombination edge corresponding to the selected replacement polygon is taken as the optimal recombination edge. In this embodiment, edges are reorganized
The corresponding replacement polygon has the smallest area change, and therefore, the reconstructed edge is selected
The edge 3 to be synthesized is replaced. Thus, by sequentially replacing each edge to be synthesized by the method, the residential area profile as shown in fig. 10 can be obtained, and compared with the original vector profile, the comprehensive residential area profile reduces the nodes of the residential area, has small area change and good comprehensive effect.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being covered by the appended claims and their equivalents.
Claims (9)
1. A residential map synthesis method, comprising:
acquiring a vector outline of a residential area and determining a threshold value to be integrated;
traversing each vector edge in the vector outline, determining an initial edge to be synthesized according to a threshold value to be synthesized, and classifying the initial edge to be synthesized to obtain a corresponding edge to be synthesized;
vector recombination is carried out on each edge to be synthesized, and the recombined vectors are subjected to grouping summation according to a grouping rule to obtain a grouping vector corresponding to the edge to be synthesized;
determining the optimal recombination edge of each edge to be synthesized according to the corresponding grouping vector;
replacing the original edge to be synthesized with the corresponding optimal restructured edge to obtain a synthesized residential area outline;
determining the optimal recombination edge corresponding to the edge to be synthesized by adopting the following method:
combining all the grouping vectors corresponding to the edges to be synthesized according to different combination sequences to obtain different recombined edges;
respectively replacing the edges to be synthesized by using different recombination edges to obtain corresponding replacement polygons;
calculating the areas of all the replacing polygons;
and comparing the areas of the different replacement polygons with the area of the vector outline before replacement, and selecting the recombination edge corresponding to the replacement polygon with the smallest area change as the optimal recombination edge.
2. The residential map synthesis method according to claim 1, wherein the threshold to be synthesized is a side length.
3. The method according to claim 2, wherein traversing each vector edge in the vector outline, determining an initial edge to be integrated according to a threshold to be integrated, comprises:
traversing each vector edge in the vector outline, and determining the side length of each vector edge;
determining a vector edge with the side length smaller than a threshold value to be integrated to obtain a vector edge to be integrated;
and combining adjacent vector edges to be integrated into the initial edge to be integrated.
4. The residential mapping comprehensive method according to claim 1, wherein said classifying process of the initial edge to be synthesized comprises:
traversing each initial edge to be integrated, and determining the type of the initial edge to be integrated through a classification standard;
and respectively processing the different types of initial edges to be integrated by adopting corresponding processing methods to obtain corresponding edges to be integrated.
5. The residential mapping integration method according to claim 4, wherein said classification criteria are:
6. The residential map comprehensive method according to claim 5, wherein said simple side processing method comprises: and obtaining a previous vector edge and a next vector edge of the initial edge to be synthesized to form the edge to be synthesized.
7. The residential map comprehensive method according to claim 5, wherein said complex edge processing method comprises:
adding the vector sides to be integrated in the complex sides into corresponding vector side groups to be integrated one by one according to the order of the sides until the vector sum side length of one vector side group to be integrated is more than 2 times of a threshold value to be integrated or the vector sum side lengths of all the vector side groups to be integrated are more than the threshold value to be integrated;
and combining all the vector edges to be integrated added into each vector edge group to be integrated into the edge to be integrated.
8. The residential map synthesis method according to claim 1, wherein the edges to be synthesized are grouped by:
carrying out vector translation on the vector edges of the edges to be synthesized so as to translate starting points of all the vector edges forming the edges to be synthesized to the same node;
and grouping all the translated vector edges according to a set grouping rule.
9. The residential map comprehensive method according to claim 8, wherein said grouping rule is: between two vector edges, | alpha is satisfied 1 -α 2 |<Theta or | alpha 1 -α 2 -π|<Theta, then the two vector edges are divided into the same group, where alpha is 1 、α 2 The azimuth angles of the two vector edges are respectively, and theta is a preset angle threshold value.
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