On Wed, 21 May 2025, Schumacher, Mia via gdal-dev wrote:
I am trying to use new gdal raster reproject to georeference image chunks
using ground control points. I figured that for some of these chunks, due
to ship movement, the lower left & lower right image coordinates are
switched, which (understandably) leads the algorithm to fail. however,
there is no error message, it just doesn't produce output. I use:
gdal raster reproject -r bilinear --to SRC_METHOD=GCP_HOMOGRAPHY --co
COMPRESS=DEFLATE -d EPSG:4326 -i 2025-03-17_08-30-44_0_ch0_0_chunk_tmp.tif -o
2025-03-17_08-30-44_0_ch0_0_chunk_tmp_WGS84.tif
with gcps applied like so:
gdal_translate -of GTiff \
-gcp im_x_ul im_y_ul lon_ul, lat_ul \
-gcp im_x_ur im_y_ur lon_ur, lat_ur \
-gcp im_x_ll im_y_l lon_ll, lat_ll \
-gcp im_x_lr im_y_lr lon_lr, lat_lr
(ul/r, ll/r = upper/lower left/right) --> but sometimes, ll and lr are
switched
I would love to catch the error to adjust those files - Is there something
like a verbose mode for gdal raster reproject? Then i could see what is
going on?
gdal_translate --debug on
might give you more information.
(I am also not sure that your have the right numbe of commas
in the line above.)
--
Andrew C. Aitchison Kendal, UK
and...@aitchison.me.uk
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