[gdal-dev] converting from EPSG:3857 to EPSG:25832 , gdaltransform works, gdalwarp not ?

[Andrew C Aitchison]

On Sun, 27 Jul 2025, Peter Bennewitz via gdal-dev wrote:

> Dear all,
>
> Overall, I'm trying to convert ESRI SHAPE data, given in "Web Mercator" 
> EPSG:3857 , to a TIF in   ETRS89 / UTM Zone 32U , EPSG:25832 .
>
> The GDAL Version is the one included in current stable Debian, 
> https://packages.debian.org/bookworm/gdal-bin ,  gdal-bin (3.6.2+dfsg-1 and 
> others)
>
> The first step, rasterization, works flawless:
>     gdal_rasterize -a_srs EPSG:3857 -tr 10 10 -burn 1 q.shp q.tif
 	...		...
> However, running the TIF through gdalwarp, and checking the result with 
> gdalinfo, does not show a plausible bounding box:
>
>   gdalwarp  -s_srs EPSG:3857 -t_srs EPSG:25832 q.tif w.tif

Not really answering your question but why are you
rasterizing and then warping ?
I would use ogr2ogr to convert srs and then rasterize:
      ogr2ogr -s_srs EPSG:3857 -t_srs EPSG:25832 w.shp q.shp
      gdal_rasterize -tr 10 10 -burn 1 w.shp w.tif

Note that  ogr2ogr is <dst_dataset_name> <src_dataset_name>
but gdal_rasterize is <src_datasource> <dst_filename>
  - ie the reverse order.

If the source is properly geolocated,
the "-s_srs EPSG:3857" in the ogr2ogr command is optional.

-- 
Andrew C. Aitchison                      Kendal, UK
                    andrew at aitchison.me.uk