The image coordinates are usually slant or ground range and azimuth.
Slant range is a measure of the radial distance of the image object from the radar.
Ground range is a measure of the distance of the object from a point directly below the aircraft. Near range in the images is closest to the aircraft and far range is furthest away. The data is in compressed Stokes matrix format, which has 10 bytes per pixel. From this data format it is possible to synthesize a number of different radar backscatter measurements. Each pixel contains information about the radar backscatter for a single frequency only.