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

[Conrad Bielski]

 Hi Mike,thanks for the prompt. Looking into it, the data are DEM corrected latitude/longitude. A GDAL info shows it as a regular raster band: Band 1 Block=4865x1 Type=Int32, ColorInterp=Gray
How can I take advantage of VRT? That sounds like a great potential solution.ThanksConrad

    On Friday, October 18, 2024 at 12:01:27 PM GMT+1, Michael Sumner <mdsumner at gmail.com> wrote:  
 
 
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 = latitude2. Band 2 = longitude3. 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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