Hi,
I’m trying to track down systematic pixel shift effects observed with
warping data using geolocation arrays:
https://trac.osgeo.org/gdal/ticket/6959
Essentially, the same data (image and location) provided as geolocation arrays
is warped to a different output depending on how the arrays are laid out –
WESN, WENS, EWSN, EWNS.
Gdalwarp produces least shift in warped data when the input arrays themselves
are oriented WENS.
Is there a definitive definition for interpretation of lat,lon,value when
geolocation arrays – i.e, are the lat/lon representative of pixel center (which
I think should be the intent)?
Does GDAL by default assume that the geolocation value corresponds to the
top/left of the pixel? Could this confusion result in the observed systematic
shift?
Alternately, could the input arrays be reoriented to WENS using VRTs instead of
rewriting large raster files?
Piyush
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