The RPC（Rational Polynomial Coefficients）model is a kind of universal expression model for image

geometry, which can be used to express accurately all the image geometric relations and has been widely accepted by

industry. Based on a description of the rigorous sensor model for domestic optical satellite imagery, this paper

deals with the RPC model and unbiased estimation algorithm. Using the imagery of the domestic satellites ZY1-02B and

ZY2-03, the authors have proved the correctness of the method and the adaptability of the RPC model for domestic

satellite imagery.