An influence of meteorological conditions on the accuracy of PS interferometry measurements

We discuss analysis of the PS scatterers located in Moscow city using long-term series of PALSAR images. 29 PALSAR observations made from ALOS satellite repeated orbits in 2006-2010 were used in our analysis. One of important features of the data stack was the fact the observations were made in different meteorological conditions - in warm and cold seasons, in dry days and in the case of precipitations. To demonstrate the manifestation of meteorological conditions we selected a set of PSs on the Delta hotel building located in the eastern part of Moscow city. Analysis of the PSs displacements shows that long-term stability of the Delta hotel location is about 0.9 cm. The value is most likely determined by SAR instrument thermal noise and clutter, not the stability of the hotel location. The accuracy of the separate scatterers location having 30-35 dB sigma-zero is 0.5-1 cm. The accuracy decreases till 2-2.5 cm in rainy and winter days.