The SHAC2000 E-SAR is a multi-frequency Synthetic Aperture Radar (SAR) instrument. The special features of the E-SAR instrument are its very high resolution, flexible operating bands and polarisation, characteristics that allow high rates of data output and, by changing operating bands in flight, multi-band imaging. Multiple, successive flights were also flown enabling the extension of the polarimetric content at X- or C-bands.