Is there a simple way to get sentinel-1 GRD data on a longitude-latitude-grid using SNAP? I guess I could create a lon-lat-grid first and use the collocate function, but is there a better way?
- Range Doppler Terrain Correction: Select WGS84 (DD) as projection and a good DEM (SRTM 1Sec AutoDownload)
- Ellipsois correction: Select WGS84 (DD) as projection.
Then proceed with:
- Band Maths: Create two bands named longitude and latitude (disable the 'virtual band' option) with these expressions: $x and $y respectively. This will write the coordinate of each pixel into a new band.
Figured out how to do it (this is very basic functionality, but I write it anyway in case someone is as confused as I was). I'm definitely not an expert, but this worked for me.
Two steps, though I'm not sure if the second step is necessary
Apply a correction: Radar-> Geometric -> Ellipsoid Correction -> Average Height Range-Doppler (or whatever correction that suits your purpose)
Reproject: Raster -> Geometric -> Reprojection. In the window that opens, select the reprojection tab and make sure that the projection is Lat/Lon.