610results about How to "Flat shape" patented technology

The invention discloses a street center line extraction method. A spatial topological relation of point, line and plane objects in a geometric network of a street is built by building a street block surrounded by street planes, so as to provide start and stop reference conditions for the extraction of a street center line. The method comprises the following steps: acquiring the street block according to the street planes; acquiring adjacent street blocks of each street block; sequencing the adjacent street blocks according to an anticlockwise direction; screening out a street block having a shared street with the original street block from the adjacent street blocks; building a polygonal segmental arc topology of a road network according to whether the shared street exists between the street blocks or not, and generating an initial center line; correcting the polygonal segmental arc topology according to the initial center line; building a complete topology among points, lines and planes according to the corrected polygonal segmental arc topology, and regenerating a center line; and finishing the center line at an intersection. The street center line extraction method solves the problem in extraction of the street center line from vector data of the street planes and can acquire a topological relation of the road network; and a center line extraction result has the advantages of precise position and smooth shape.