Dear friends,
I have a problem in M.Sc. thesis which talk about Accuracy Assessment and Enhancement of Rational Polynomial Coefficients of Satellite Imagery.
Data used are a stereo-pair of high resolution satellite imagery, provided with related RPCs and sets of ground control points affixed.
By least-squares adjustment involving the provided RPCs and coordinates of ground control points based on RFM as a mathematical model to get measured image coordinates of control points.
Assessing the accuracy of provided RPCs by computing the differences among measured and computed image coordinates of control points are too big.
ex.
The coordinates of first point are 30.02513328 deg. & 31.24722372 deg. & 43.50 m on the ground. The measured image coordinates of this point in pixel are 667.61 col. & 322.32 row and the computed image coordinates are 3161 col. & 1658 row
what is the problem?
Thank you for all
If you are sure of the coordinates of ground and image points, the problem either in the used code or the units of provided RPCs. Have a good luck.
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