How much precise is the location of the PS points retrieved?
For each PS point retrieved, a pair of coordinates is given (usually geographic latitude and longitude or UTM northing and easting). Accuracy of location of the PS depends on the resolution of the SAR system, and it is around 10 meters in East and 2 meters in North. In order to give a PS its real coordinates, that is in order to move from SAR coordinates (azimuth and range) to ground coordinates, it is necessary to know the PS elevation on the ground. The more precise the height of the point, the highest the location accuracy. When the elevation is not correct, the PS will be projected on the ground in a wrong location.
