Dear colleague,
TRAIN, is the best solution as free available atmospheric correction toolbox, please see
The idea simply more inteferograms return more date expansion in order to detect the displacement in any AOI, this is the first thing, on the other hand more infgams, give the facility to the user to exclude and reduce the high Bp which are more sensitive to height and ultimately get more topographic residual, and also more infgam. give more coherent determined object.,
Please have a look at this post regarding to pyrate
Hope the foregoing answers your query.
Dear @marpet , @mengdahl , I think still pyrate hasn’t been included within SNAP 8!