Comparison between Plane and Stereo Block Adjustment For ZY-3 Satellite Images

Abstract

In response to the problem that block adjustment for satellite images cannot be solved with weak convergence geometric conditions,aplane block adjustment method is proposed that utilizing DEM as height constraint plane block adjustment method to improve the targeting precision of images.First,rational function model(RFM)with affine transformation is selected as the mathematical model of the satellite image plane block adjustment.Second,to update the ground coordinates of tie points(TPs),the plane coordinates of TPs are only solved in the adjustment process.Elevation values obtained using DEM interpolation.Finally,the plane coordinates of all TPs and orientation parameters of all satellite images are solved through plane block adjustment with a few ground control points(GCPs).ZY-3nadir images of two regions are tested for plane block adjustment and ZY-3forwardnadir-back images of the same two regions are tested for stereo block adjustment.Comparison indicates that almost the same accuracy can be obtained by plane block adjustment support with 1∶50 000 DEM and stereo block adjustment for ZY-3images.For ZY-3nadir images,when global DEM with 1km grid and SRTM with 90mgrid replaced 1∶50 000DEM as elevation control,It is almost no loss of accuracy of plane block adjustment The test results proved the effectiveness and feasibility of the plane block adjustment method.