[gdal-dev] Reprojecting image with lat/lon bands - best practice?

[Michael Sumner]

Check if gdalinfo sees the longitude and latitude as geolocation arrays,
then just warp to grid you want.

If they aren't auto identified this can be arranged with VRT.

Cheers, Mike

On Fri, 18 Oct 2024, 21:55 Conrad Bielski via gdal-dev, <
gdal-dev at lists.osgeo.org> wrote:

> Hi Javier,
>
> it is not a grid. So each raster pixel is assigned the geolocation. Yes -
> if I was to extract it, that's what it could be considered.
>
> Conrad
>
> On Friday, October 18, 2024 at 11:37:28 AM GMT+1, Javier Jimenez Shaw <
> j1 at jimenezshaw.com> wrote:
>
>
> Is it an actual grid? in the meaning of having constant step size in X and
> Y.
> In that case the geolocation is just the corner and the x and y sizes. You
> can convert to a georeference raster, and warp it.
> If it is not the case, you have something more like a 2D pointcloud, or a
> bunch of poins in a strange vector format.
>
> On Fri, 18 Oct 2024 at 12:20, Conrad Bielski via gdal-dev <
> gdal-dev at lists.osgeo.org> wrote:
>
> Hello GDAL-experts,
>
> normally when I use GDAL for reprojecting imagery, the projection
> information that I use is the source spatial reference (SRS) associated
> with the imagery. However, now I have imagery which is lat/lon geographic
> and I have two separate bands which also carry the pixel geographic
> information. So the following raster inputs all the same size:
> 1. Band 1 = latitude
> 2. Band 2 = longitude
> 3. Band 3 = imagery
>
> The question I have is how best to integrate this information into a
> reprojection workflow?
>
> I presume that gdalwarp is the best option here, but how can I take
> advantage of the individual pixel location information (rather than just
> the extents for example)? I know that I can mosaic into an existing file
> that I have already created in the target projection. Is this the best way
> to apply gdalwarp in this context?
>
> I'm just wondering what is the best way to integrate the lat/lon pixel
> information into my warping using gdalwarp.
>
> Thanks in advance for your help,
> Conrad
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