Frank,
The short story:
I've got some Single Look Complex EnviSat data I need to process. Will
gdalwarp do a piecewise (triangulated) warp using GCPs or only(!) use them to
calculate an image-wide polynomial?
The longer story:
ESA's Best (http://earth.esa.int/services/best/) does an OK job extracting the amplitude
from the data, but because it uses tiff files for intermediate storage, and their implementation is
limited to 2gb tiffs, it's necessary to tile an input image. Best assigns a different affine
transformation to each output GeoTiff tile, which causes a mis-alignment of the tiles when
re-assembling them (using gdalwarp etc). Best does output an extensive metadata text file with
each tile including a geolocation "array" of latitude and longitude. Unfortunately the
"array" is not regular (eg, my test tile has values for lines 1, 811, 812, 1622, 1623,
2240; every 165 pixels except the last interval which is 195 pixels). If gdalwarp would use this
semi-regular array to triangulate the pixel locations, that would be great, otherwise I'll have to
use something else...
Thanks!
Brent Fraser
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