Hello everyone,

 I tried to refine rpcs model of ZY-3 triplet according to the post (https://support.pcigeomatics.com/hc/en-us/articles/208251763-Improve-Accuracy-of-RPCs-and-Export-to-Common-Format). Everything is fine, but the refined rpc files only changed a little. As a result, the triplet didnot align well and obvious displacements in x and y direction exist. I can't figure out why. Can anyone know it?