Interferometry is the most accurate

Interferometry is the most accurate measurement possible. That’s why it is used to measure large distances (to stars) and very short distances (size of atoms etc.). However, it absolutely requires a coherent target. This means that the target cannot move more than ¼ of a wavelength between acquisitions. So for RSAT2 the target cannot move more than 5.5cm. / 4 = 1.375 cm. in the 24 days between each acquisition. If we use data sets which are acquired at 48 or 72 day intervals, the restriction remains. Any movement bigger than 1.375 cm. will result in reduced coherency. For your data sets, where you see bands of solid colours, you have good coherence. In the areas where the measurements are “speckley” (for example over water or areas of shadow (no signal)) the results are unreliable. That’s why we usually average over many combinations of data sets. I should caution that we have not integrated the phase unwrapping yet. We expect to complete it before the next release. This means that large displacements bigger than 5.5 /4 = 1.375 cm. between acquisitions may be incorrect. This will not be a problem in the release version.

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