Mathematical Modeling of Ikonos Geo Image

This paper presented a rigorous mathematical model based on orbital parameters for correction of the geo-rectified images such as Ikonos Geo, where the geometry of image at the time of imaging is lost and minimum information regarding the satellite movement in its orbit is available. Based on this model, the geo-rectified image is converted back to its geometry at the time of imaging at first. Then the Orbital Parameter Model is implemented to the resulted image to extract high accurate 3D spatial information from the image. The developed model has been tested on geo-rectified images such as SPOT L1B, and IKONOS Geo images taken over two test areas in Iran. This is followed by the results of various geometric accuracy tests carried out using different parameters and combination of control and check points. Then the results of this model are compared with those obtained through a generalized model based on Rational Function Model (RFM). The results show that, the orbital parameter model can achieve sub-pixel accuracy with little number of Ground Control Points (GCPs), where RFM gives the results with an accuracy about pixel, but with more number of well-defined and well-distributed GCPs.