2 results about "Digital surface" patented technology

The invention discloses a method for automatic extraction of an orthoimage embedding line based on projection digital elevation models. The method comprises the steps that firstly, the projection digital elevation model of a single orthoimage is obtained; secondly, an orthoimage pair to be embedded is determined; thirdly, the projection digital elevation models of the orthoimage pair to be embedded are overlapped according to geographic coordinates, an overlapping image is obtained, the overlapping image is binarized, and then the binary overlapping image is obtained; fourthly, the image morphological method is adopted for extracting skeleton lines of the binary overlapping image, a skeleton line network is obtained, the Dijkstra algorithm is adopted for searching the skeleton line network for the shortest path, namely the embedding line of the orthoimage pair to be embedded. By means of the method, the high-quality orthoimage embedding line can be obtained automatically, and the production efficiency of orthoimage products can be improved; meanwhile, information of digital terrain model data and digital surface model data is used for searching for the embedding line, and therefore the quality of the orthoimage products can be improved.

The invention discloses a quick estimation and three-dimensional display method for visual green land areas of city floors. The method comprises the following steps of 1) calling a building layered modeling algorithm to perform base contour extraction and automated three-dimensional modeling on building digital surface model data so as to generate corresponding Shp graphic layer and Multipatch model; 2) calling a floor visual green land estimation algorithm to perform ornamental green land area automatic estimation on extracted building floors; 3) updating attribute fields of a building three-dimensional model and a building base contour model, and performing layered color-setting display. According to the method, a vertical city visual green land analysis concept is innovatively proposed, automated estimation and quick modeling display functions are realized at the same time, and manpower cost of actual measurement is reduced; and the method meets partial demands of people such as city residents, city planners, decision makers, house dealers and the like in related aspects of green landscapes, and has a certain social benefit and economic value.