yes I see, well you can probably set a target GeoTIFF with the geotransform that you want - and gdalwarp to that as the target. I don't believe you can do that with gdalwarp directly, and I have no idea with python - and finally I'm sorry to add irrelevant discussion - but this is interesting and I'm going to try it out in R and C++ and would love to see a python example too.
Cheers, Mike On Sat, Nov 5, 2022 at 2:21 PM Brendan Heberlein <bheberl...@wisc.edu> wrote: > Hi Mike, > > regardless of the map projection, it may be desirable to have the grid > oriented in one direction or another, e.g. due to the spatial distribution > of data points. Although the CRS/SRS designates the coordinate axes, these > are not always aligned with the desired grid orientation. > > So, basically I want to be able to specify an arbitrary geotransform array > for the output grid. This would allow the grid to be assigned an arbitrary > orientation within the CRS frame. > > Thanks, > Brendan > ------------------------------ > *From:* Michael Sumner <mdsum...@gmail.com> > *Sent:* Friday, November 4, 2022 6:57 PM > *To:* Brendan Heberlein <bheberl...@wisc.edu> > *Cc:* gdal-dev <gdal-dev@lists.osgeo.org> > *Subject:* Re: [gdal-dev] Specify Grid Rotation for gdal.Warp() with > Geolocation Arrays > > well, the map projection does this - there are many possibilities. Or, do > you have another geolocation array you want as the target? > > If you have an example I'm happy to try a few things, but I'd assumed you > had a target map projection in mind. What kind of crs to choose depends on > your goal, or is purely to not have north up? > > Perhaps there's something terminology wise I'm missing ... > > Mike > > On Sat, 5 Nov 2022, 10:50 Brendan Heberlein, <bheberl...@wisc.edu> wrote: > > Hi Mike, > > thanks for the response. > > Can you clarify how I would go about specifying the grid orientation for > the output raster? None of -te, -ts or -t_srs address this. > > > ------------------------------ > *From:* Michael Sumner <mdsum...@gmail.com> > *Sent:* Friday, November 4, 2022 6:41 PM > *To:* Brendan Heberlein <bheberl...@wisc.edu> > *Cc:* gdal-dev <gdal-dev@lists.osgeo.org> > *Subject:* Re: [gdal-dev] Specify Grid Rotation for gdal.Warp() with > Geolocation Arrays > > that's exactly what the warper does with geolocation arrays, set the > target extent, dimension, and crs with -te, -ts, -t_srs with gdalwarp. > > python will have those analogous controls for the warper. > > Cheers, Mike > > > > On Sat, 5 Nov 2022, 01:23 Brendan Heberlein via gdal-dev, < > gdal-dev@lists.osgeo.org> wrote: > > Hello, > > I would like to be able to warp an image dataset using a geolocation > array, while specifying the grid to which the output dataset is sampled. > Specifically, I want to be able to warp the dataset to a grid which is not > oriented North-up. > > Can GDAL support this currently? Or, what is the likelihood this could be > supported in the future? > > I primarily rely on the Python bindings, so a solution within that > framework would be ideal for me. > > Thanks! > — Brendan > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev > > -- Michael Sumner Software and Database Engineer Australian Antarctic Division Hobart, Australia e-mail: mdsum...@gmail.com
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