Abstract
Atmospheric propagation delays limit the measurement accuracy of post-and inter-seismic deformations, subsidence induced by mining or fluid extraction, or ground motion. It is particularly important to devise techniques to improve our understanding of electromagnetic delays in the atmosphere and to mitigate their effects on SAR measurements. The article compared GPS PWV and MODIS PWV in Beijing and concluded the correct model of MODIS PWV. The MODIS PWV for correct model is better than MODIS PWV. The mean value of the minus results of MODIS modified PWV subs tract from GPS PWV in summer is-0.8mm, while the mean value of the minus results of MODIS PWV subs tract from GPS PWV in summer is 5.9mm. The mean value of the minus results of MODIS modified PWV subs tract from GPS PWV in winter is-0.1mm, while the mean value of the minus results of MODIS PWV subs tract from GPS PWV in winter is-0.6mm.
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