Somayeh Yavari - M. Sc. Photogrammetry Engineer Faculty of Geodesy and Geomatics Engineering, K . N. Toosi University of Technology, Tehran, IRAN
Mohammad Javad Valadan Zoej - Associate Professor Faculty of Geodesy and Geomatics Engineering, K. N. Toosi University of Technology, Tehran, IRAN
Saeid Sadeghian - Assistant Professor Geomatics College of National Cartographic Center (NCC), IRAN

This paper proposes a model to extract 3D spatial information from the geo-rectified images which their geometry at the time of imaging has been lost. Based on this model, first the geo-rectified image is converted back to its geometry at the time of imaging. 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. For the IKONOS Geo and SPOT L1B, the sub-pixel accuracy was achieved using the Orbital Parameter Model. Later the results of the developed model have been compared with Rational Function Model (RFM) results.

Geo-rectified images, Orbital Parameter Model, Rational Function Model