I am attempting to InSAR process some R-2 data through to unwrapped phase. I use Snaphu Export, then attempt to run Snaphu in VMplayer as recommended for Windows users. I immediately get a message indicating that my pixel spacing value, dr, is negative. (See below). I have edited the file to make it positive and snaphu will run, but it produces a simple phase gradient across the image.
Any thoughts on why dr is negative?
noticed that SRTM 3sec data is downloading automatically for sample data set when running graph. and processing successfully without “Negative pixel spacing in snaphu”.
How to overcome this issue, to auto download DEM and execute TopoPhaseRemoval…
I tried with applying aster 30m DEM as well. But no change in result.
Hello ABraun,
I am facing this issue while doing the unwraping. Before Unwraping, I did a few operations like Multilookingg, calibration, stacking, interferogram generation. I am using RadarSAT2 Fine Quad data.
I got similar issue regarding negative pixel spacing. And I think this happen because using descending mode data. But, if I use ascending data, the value will be positive.