InSAR Accuracy

The measurement accuracy of InSAR from commercially available SAR satellites has been shown to be approximately 1 mm where there is no impact on the measurement from atmosphere and topographic noise, for example, measuring relative movement of two corner reflectors located very close together.

Surface movement measurements in real world situations involves measuring the phase difference between pixels that extend for several kilometers. For these infield measurements, atmospheric and topographic noise have a large impact upon the measurement and good noise removal algorithms become essential for accurate measurements.

During an oil field trial in the desert, a comparison of GPS readings and InSAR measurements showed an RMS error of 5 mm.
Over an oil field in Alberta, comparison of multiple independent SAR beam modes demonstrated an accuracy of 3% of the total deformation measured and a mean absolute difference of 4 mm.