Abstract
The present paper proposes a method for geometric correction of AVHRR data. A Keplerian model for NOAA satellite and the Bessel ellipsoidal model for the Earth are used. Due to the size of AVHRR imagery, the bilinear interpolation is used to speed up mapping procedure. The optimal block sizes for using interpolation on satellite and map imagery are determined. Because the orbital information on the TBUS still exists tiny errors, there is still some residual error only using THUS. Thus, GCP is usually used to improve the accuracy of geometric correction. The tendency of each orbital element and satellite reported time (satellite internal clock)for the GCP's residual error is analyzed by curve fitting method as a polynomial expression. An algorithm with the polynomial expressions is used to estimate the variations of each orbital element and satellite reported time from the GCP's residual error. Finally, An experimental result is shown to verify the proposed method, and we will conclude our proposed geometric correction method.
