error was 0.97 pixel. In each case of the georeferencing, an
image was resampled to a pixel resolution of 1m.
Then, the TerraSAR VV polarization image was geometrically
corrected, and its coordinates were transformed to
the coordinates of the georeferenced Quickbird images. In
order to correct the SAR image, 15more regularly distributed
GCPs were selected from different parts of the image. For
the actual transformation, a second-order transformation
was used. As a resampling technique, the nearest-neighbour
resampling approach was applied and the related RMS error
was 1.26 pixel. As both optical and microwave images had a
very high spatial resolution, the errors of less than 1.4mwere
considered as acceptable for further studies.