Analysis of the Geometric Accuracy of Msg-seviri Imagery for Estimation of Climate Variables

The geometric accuracy of the images acquired by the SEVIRI instrument aboard the European geostationary satellites MSG-1 and MSG-2 has been investigated in this study. Level 1.5 image data of the High-Resolution Visible (HRV) band with 1-km GSD and several multispectral bands with 3km GSD at sub-satellite point have been provided by the Swiss GCOS Office at MeteoSwiss. A set of fully automated processing methods has been adopted, developed and implemented for the evaluation of relative and absolute accuracy of the HRV images. For the evaluation of the relative accuracy, large numbers of feature points are extracted and tracked through images of the same day. To assess the absolute accuracy, lakes in the area are used as reference and matched automatically in the HRV images. A number of SEVIRI images acquired in 2008 have been analyzed and relative and absolute shifts of up to about 10 pixels have been observed.