Automatic Change Detection of Geo-spatial Data from Imagery

Automatic change detection and data updating is a very important issue for keeping the temporal accuracy and currency of spatial data sets. The problems and difficulty of current change detection techniques are presented in this paper. According to whether registration is done before change detection algorithms, authors classify change detection into two categories: change detection after image registration and change detection simultaneous with image registration. For the former, four topics including change detection between new image & old image, change detection between new image & old map, change detection between new image/old image & old map, change detection between multi-source images and old map/image are introduced and described. For the latter, three categories that is change detection between old DEM, DOM and new non-rectification image, change detection between old DLG, DRG and new non-rectification image, 3D change detection between old DEMs, DOMs and new multi-overlapped photos are discussed in the paper. At last the conclusions are given.