关键词: 建筑物提取, 数字高程模型, 遥感影像, 图像处理

Abstract: Automatic building extraction is the key factor of building map based on remote sensing image.Aiming at the limitations existing in the current algorithms，a novel algorithm for automatic building extraction based on Digital Elevation Model（DEM） is proposed.The algorithm，which takes the amount of calculation into account fully，is built on the base of mathematical grey scale morphology，vector conversion，discretization noise elimination and edge simplicity.Experimental results show that the algorithm can extract building clearly and correctly，and reduce the redundancy greatly.

Key words: automatic building extraction, Digital Elevation Model（DEM）, remote sensing image, image processing