Building outline automatic identification method based on building general plane positioning map

The invention discloses an automatic identification method for a building contour based on a building general plane positioning map, and the method comprises the steps: S1, obtaining all characters on the building general plane positioning map, and carrying out the traversing of a character string containing a specified character; S2, searching a curve closest to a character string containing a specified character on the building general plane positioning map, searching a closed graph based on the closest curve, and extracting all curves of a corresponding layer where the curve forming the closed graph is located; S3, for unidentified curves in the curve set, finding out closed graphs in the same graph layer; S4, according to the building type of the input building general plane positioning map, respectively screening the closed graphs to obtain a building contour; S5, performing 3D software rendering modeling on all the building contours to obtain a building three-dimensional schematic model. According to th