[gdal-dev] dimap pleiades issues

[Dennis Gocke]

Sorry wrong link. This is the dimap pleiades test dataset:
https://drive.google.com/file/d/0B_pKTK9WcAW4RktQUEE2bzVDdGM/view?usp=sharing


On Tue, Jun 23, 2015 at 3:43 PM, Dennis Gocke <dengo at gmx.net> wrote:

> Hi guys,
>
>
>
> following the discussion
> http://thread.gmane.org/gmane.comp.gis.gdal.devel/40628 I did some tests
> with a pleiades dataset.
>
> First of all, Astrium’s very own tool (which now vanished from their page)
> to convert the pleiades RPC*.XML to _RPC.TXT did not change SAMP_OFF and
> LINE_OFF according to the 1,1 pixel center convention, so using this
> _RPC.TXT would probably cause issues in most software.
>
>
>
> So I wanted to see how the GDAL pleiades mdreader works and stumbled
> across some issues:
>
> - the pleiades mdreader is not triggered when opening the dimap file.
>
> - when the image is tiled, the dimap reader only opens the first file but
> has raster dimensions of all tiles, so trying to read pixels, where the
> other tiles should be used, crashes.
>
> - neither a geotransform nor GCPs are provided when opening the dimap file
> (unrelated issue).
>
> - when opening the individual tile tifs the pleiades mdreader is triggered
> and reads the RPC. But it provides the same RPCs for all tiles, which means
> for every tile apart from the upper left tile the RPCs are not correct.
>
>
> I’ve uploaded a Pleiades sample with tiles (blackened pixels) here:
>
> https://drive.google.com/file/d/0B_pKTK9WcAW4UnA2LWJpbFE1ZTQ/view?usp=sharing
>
>
> I think it would be great if GDAL could load all tiles as mosaic from the
> dimap (similar to the DG TIL driver) and would provide the RPCs from the
> pleiades mdreader for this mosaic raster. This would avoid using various
> workarounds.
>
>
>
> Best Regards,
>
> Dennis
>
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