[Qgis-developer] gdalwarp fails, Save as... reprojected works

[Giovanni Manghi]

> Hi all,
> reprojecting a raster from 4326 to 3857 through Save as... menu works,
> whereas the same through Processing does not:
>
> gdalwarp -ot Float32 -t_srs EPSG:3857 -r near -of GTiff -te -20.0 40.0
> 20.0 90.0 -te_srs EPSG:4326 -co COMPRESS=DEFLATE -co PREDICTOR=1 -co
> ZLEVEL=6 -wo OPTIMIZE_SIZE=TRUE gt30w020n90.dem OUTPUT.tif
> GDAL command output:
> ERROR 1: tolerance condition error
> ERROR 1: -te_srs ignored since coordinate transformation failed.
>
> With GDALTools it works. The CL in this case is:
>
> gdalwarp -overwrite -s_srs EPSG:4326 -t_srs EPSG:3857 -of GTiff
> gt30w020n90.dem test_repro.tif
>
> So apparently Processing introduces unnecessary, damaging, params.

I assume that your input is

http://svn.simo-project.org/tools/trunk/txt2latlon/data/

A quick test from the cli would have shown you that the issue is in

"20.0 40.0 20.0 90.0"

for the "-te" parameter. If a smaller extent is defined the
tool/command works (in fact the exact extent of the raster is not that
one). Leaving the extent automatically defined/computed by Processing
does not seems to be an issue for the majority of inputs.

Regarding this tool my question is another: why the "te_srs" parameter
(and by consequence also "te") has been made mandatory?

-- G --