We found a spatial shift between
- the SRTM 3arcsec downloaded by s1tbx during geocoding
- the (official) SRTM tiles downloaded from USGS or JPL (http://www2.jpl.nasa.gov/srtm/cbanddataproducts.html).
The shift is exactly one pixel length in north and one pixel length in east direction. It appears that this difference stems from a different sample size of the tiles:
- s1tbx downloads tiles (.tif) with a sample size of 1200x1200
- USGS and JPL provides tiles (.hgt or .tif) with 1201x1201.
Comparisons with other data (e.g. Landsat imagery) suggest that the files from s1tbx are displaced.
Can you clarify the source and the manipulations of the SRTM tiles that are provided via s1tbx?