The gridding method for computing the geographical position of Advanced Very High Resolution Radiometer image pixels is based on a model that takes as input the TBUS mean orbital elements and an improved value of a parameter giving mean satellite speed. An accurate speed value can be found if the satellite is close to the equator at subsequent TBUS times. The resultant gridding errors found by comparison with Svalbard coastlines are attributed to scan line timing and satellite attitude. Errors are corrected by parallel displacements and images gridded to 1-2#xA0;km accuracy are used for ice mapping in the Fram Strait.
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