Differential synthetic aperture radar interferometry (InSAR) has already proven its potential for ground subsidence
monitoring. In recent years Multi-Temporal InSAR technology has been rapid development. Coherence of interferogram is
an important indicator to measure the interferometric phase in the Multi-Temporal InSAR system. This paper study the
effect of the Spatial-Temporal baseline on coherence for SAR images in Multi-Temporal InSAR processing base on the
aspect of statistics. on the basis of a large amount of data, a formula for calculating coherence for SAR images was
deduced which it correspond to the relationship between Spatial-Temporal baseline and the coherence of interferogram.
This formula can optimize the selection of interference image pairs during processing Multi-Temporal InSAR. To
determine whether this formula is useful, two methods of interference image pairs selection was used, one is the formula to
optimize the selection, another is the traditional fixed threshold method. The author compared the coherence of
Interferogram to judge the merits of the two methods. The results indicate that the formula not only select more
interferogram from interferogram stack, but also increase the number of highly coherent points. And use SBAS-InSAR
technique to obtain the 2010-2013 Beijing urban land subsidence information, verification monitoring accuracy by
comparing level monitoring result.
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