A Method for Automatically Generating Building Outlines from Scattered Shape Points of Artificial Ground Objects
An automatic generation and shape point technology, applied in the field of geographic information science, can solve the problem of not being able to restore concave polygons well, and achieve the effect of high robustness and broad application prospects.
Active Publication Date: 2021-07-09
SOUTHEAST UNIV
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At present, the algorithm for automatically generating polygons based on scattered points is relatively mature, mainly including algorithms such as binary sorting, 2-Opt Moves, SteadyGrowth, and Inward Denting. Restoring concave polygons
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[0035] The present invention will be described in further detail below in conjunction with accompanying drawing, figure 1 It is a flowchart of the present invention. like figure 1 Shown, the present invention comprises the following steps:
[0036] 1. Read the remote sensing image map of a certain area, filter out the shape point data of ground objects as training samples and perform sample incremental processing on them.
[0037] (1) Convert the remote sensing image map of the area into a shapefile format, and use the GDAL / OGR library to read the file.
[0038] (2) The unevenness of the polygon is judged according to the read polygon vertex coordinate data. Starting from the definition of a concave polygon and a convex polygon, it is judged whether the polygon contains a vertex angle greater than 180 degrees. If so, it is judged as a concave polygon; otherwise, it is a convex polygon. In view of the fact that there may be errors in the ground shape data of the building, ...
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The invention discloses a method for automatically generating building outlines from scattered shape points of artificial ground objects. The Pointer Network network model is applied to the task of building area description. For the scattered shape points of artificial ground objects, it can accurately output better The closed connection scheme automatically generates the ground outline of artificial objects. The invention comprises the following steps: (1) constructing a data set of scattered shape points of artificial ground objects; (2) constructing a Pointer Network network model; (3) adjusting network parameters so that the model can converge; (4) training and obtaining a final model. The present invention can be applied to any task of automatically generating closed areas, and can be applied to large-scale samples, has high robustness, can be applied to various complex tasks of generating closed areas in the real world, and has wide applications prospect.
Description
technology field [0001] The invention belongs to the technical field of geographic information science, and in particular relates to a method for automatically generating building outlines from scattered shape points of artificial ground objects. Background technique [0002] As an important part of urban land, artificial ground objects are closely related to the city's population, economic development, urbanization degree and other factors, and can accurately and quickly reflect the development and change of urban areas. Therefore, in the construction of digital cities During the process, the extraction and processing of artificial ground object information became the basis of follow-up work. [0003] Engineers can use methods such as total stations to measure building ground contour points, so-called ground contour points, that is, corner points with obvious turning points in the building contour area. For these sparse shape points of ground features, if the convex hull c...
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IPC IPC(8): G06T7/149G06T9/00
CPCG06T9/00G06T2207/10032G06T2207/20081G06T2207/20084G06T7/149
Inventor 张小国高烨张开心王慧青
Owner SOUTHEAST UNIV