What are the criteria for the selection of processable images?
New radar images are acquired continuously from many different satellites and thousands of them are available in the archives, but not all of them can be used for the PS Technique analysis. Images are selected prior to purchase on the basis of their radiometric quality as declared by the image provider. Customers may suggest to discard certain images (such as in case of processing of mountain areas where the customer knows the surface was for example covered by snow on the acquisition date). After focusing, SAR images are checked again and discarded if they do not satisfy certain conditions. Once the images are rejected, they cannot be recovered at a later processing step. Usually no more than 15 % of the available images are discarded. The discard is due to three main problems: high Doppler centroid value, missing lines and high geometric baselines. When the difference between the Doppler centroid of an image and the Doppler centroid of the master is too high, we talk of high Doppler
