摘要
This paper investigates the method of high-precision digital elevation model generation in gravity intermediate area topographic correction with ZY-3 stereo surveying satellite data.The rational function model has been refined with the GPS points and forward,nadir,backward image data.The experimental verification of topographic correction with 1 ∶ 10 000 high-precision digital elevation model data shows that the digital elevation model produced by ZY-3 stereo data can meet the precision requirement for 1 ∶ 200 000 gravity intermediate area topographic correction.The result obtained by the authors provides an effective means for gravity intermediate area topographic correction and expands the application of ZY-3 in regional gravity survey.