MTSAT Navigation Monitoring Guide
Computation methods
The accuracy of MTSAT HRIT image projection is evaluated by comparing coastlines recognized in MTSAT images with those on referential maps. This evaluation is known as landmark analysis.
In landmark analysis, median, contrast conversion and Laplacian filters are first applied to image to enhance contrast between land and sea, and to remove cloud contamination. Subsquently, vectors representing positional departure between the filtered image and the reference map are then determined by cross correlation. Rotational misalignment is not taken into account. Images used in the analysis are from MTSAT channels IR1 (10.8 µm) and IR4 (3.8 µm).
Error vectors computed by landmark evaluation contain both an image registration error and a landmark analysis error. Since the landmark analysis error can be assumed to have no bias, the average of the error vectors is expected to represent the most likely image registration error.
How to Read the Charts
Time Sequence of MTSAT HRIT Image Landmark AnalysisThis page also shows temporal trends and changes in HRIT navigation accuracy since the beginning of MTSAT-1R operation on 28 June 2005 and MTSAT-2 operation on 1 July 2010. Only the analysisresults for 03 UTC images are shown.