[gdal-dev] raster reproject fails without error message with GCP_HOMOGRAPHY option

[Schumacher, Mia]

> Dear gdal community,
>
> I hope this is the right spot to ask questions?
>
> 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?
>
> Anyways thank you guys so much for all the work you put into the 
> development of gdal, it is such a powerful tool!
> All the best, Mia
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20250521/ec633e06/attachment.htm>