关键词: 倾斜影像, DSM, TIN, 区域增长, 滤波, 高精度DEM

Abstract:

For the DSM of the traditional aerial images acquisition, the lack information of the facade,the local floor and the roof of the building, the problem which difficult to obtain high precision DEM, the method of extracting high precision DEM from oblique image is proposed in this paper. Firstly, the structure of cloud point of oblique image acquisition is analyzed, the DSM has a geometric constraint characteristics which can well distinguish between ground points and ground feature points in the city. Then it points out that the filtering is the key technology to obtain the high precision digital elevation model (DEM), and proposes a filtering method based on region growing segmentation TIN.Finally, the filtering experiment and algorithm validation are carried out by the oblique image data of Dunhua City, Jilin Province.The experimental results show that the method can quickly and effectively remove the different sizes of buildings,vegetation and other objects, and obtain high precision DEM.

Key words: oblique image, DSM, TIN, regional growth, filtering, high precision DEM