Errors ill the operational gridding of APT pictures
The accuracy of geographical location of cloud formations in satellite pictures is dependent on the operational methods used in gridding. It is of critical importance when the centres of storms and depressions are to be based on satellite pictures. The gridding errors arise mainly due to errors in spacecraft attitude and the lens and electronic distortions of the satellite camera system" These types of errors were determined in the APT satellite pictures received and gridded at Bombay during 1969. The results show that in extreme cases an error as high as 100.200 km can occur in the gridding of pictures without land marks however, in a majority of oases it is estimated to be about 60 km.
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