A DEM correction method and device

• Main Authors: MA CHAO, LIU WEI, REN YONGXIAN, WEN ZEHUA, WANG JIANGTAO, CHAI XIAOBING, CUI SHUAI, BAI HAIJUN, HE FENGFEI, XIE DONG, LI ANXIONG, XIE JINGBO, YANG XIAOXIAO
• Format: Patent
• Language: Chinese; English
• Published: 14.06.2019
• Subjects: CALCULATING; COMPUTING; COUNTING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS

The invention provides a DEM (Digital Elevation Model) correction method and device for an external digital elevation model, and relates to the technical field of surveying and mapping. DEM pixels andDEM pixels of an external digital elevation model are established, and a mapping relation between the DEM pixels and the DEM pixels is established; external digital elevation model DEM pixel and INSAR-DEM pixels are matched according to established mapping relation, and abnormal pixels meeting requirements in the DEM pixels of the external digital elevation model are confirmed; abnormal pixels inthe DEM pixels of the external digital elevation model are removed to obtain hollow pixels, and according to the elevation values and the corresponding INSAR-DEM pixel, a corrected pixel value of theabnormal pixel is obtained; and finally, according to the external digital elevation model DEM pixel value of the abnormal pixel and the correction pixel value of the abnormal pixel, the abnormal pixel of the external digital