Rigorous Generation of Digital Orthophotos from Eros a High Resolution Satellite Images

As the resolution of satellite images is improving, the applications of satellite images become widespread. Orthorectification is an indispensable step in the processing for satellite images. EROS A is a high resolution imaging satellite. Its linear array pushbroom imager is with 1.8meter resolution on ground. The satellite is sun-synchronous and sampling with asynchronous mode. The main purpose of this investigation is to build up a procedure to perform orthorectification for EROS A satellite images. The major works of the proposed scheme are:(1) to set up the transformation models between on-board data and respective coordinate systems, (2) to perform correction for on-board parameters with polynomial functions, (3) to adjust satellite’s orbit using a small number of ground control points, (4) to fine tune the orbit using the Least Squares Filtering technique and, (5) to generate orthoimage by using indirect method. The experiment includes validation for positioning accuracy using ground check points.