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The Munich test site has been selected for its proximity to DLR-Oberpfaffenhofen.

This enables visual inspection of results, e.g., the study what the point scatterers exactly are, and where they are exactly located. The estimated geo-referenced position can be compared to the actual position of the permanent scatterers measured in a field study. Unfortunately, only a few Envisat scenes were available for this test site. No displacement is expected for Munich, and we use the estimated displacement to estimate the actual precision under this assumption.

The estimated displacement rates apparently contain a trend, mainly in azimuth direction (y-axis), which does not correspond to actual displacement, being most probably a processing artifact. The trend could be explained by orbit errors, however it is strange that it does not manifest in range direction. Other explanations may be offered by the DEM used for the Munich area, although it is not expected that terrain height would cause an error in the estimated displacement.



Figure 19: Estimated time-linear displacement for 16560 pixels of 20420 with test below 3.0 (ca. 51 per km2, but note that large areas do not contain any point). The estimates are between -12.5 and +4.0 mm/year. Red corresponds to -5 mm/y and blue to +5 mm/year.