[gdal-dev] Resampling a raster with gdalwarp

[Giovanni Anconitano]

Hello,

I have a question about how to properly set the -tr flag when using
gdalwarp.
In particular, I'm using gdalwarp for resampling a GeoTiff from its
original resolution to a target resolution.
Let's consider, for simplicity, the original pixel size equal to (5m, 5m)
and the target resolution equal to (10m, 10m).

This is the command I use: gdalwarp -tr 10 -10 input.tif output.tif

I'm using a negative <yres> because when I open the GeoTiff file in QGIS,
or if I use gdalinfo, I get a pixel size equal to (5, -5) for the source
raster.

Is it correct to use a negative <yres> with gdalwarp? I also tried -tr 10
10, but the result seems to be the same as the case in which I use -tr 10
-10.
In both cases gdalinfo and QGIS display (10,-10) as the pixel size.

How does gdalwarp treat a negative yres value?

Thank you

Giovanni

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