[gdal-dev] GeoTIFF gdalwarp puzzle

[Carl Godkin]

Thanks for checking, Jukka.

I am using GDAL 3.3.3 and get a smaller range:

d:\gdal-3.3.3\bin64\gdalwarp.exe  -t_srs epsg:4326 "Caribbean 2 VFR
Chart.tif" caribbean_4326.tif
Copying color table from Caribbean 2 VFR Chart.tif to new file.
Creating output file that is 18714P x 10830L.
Processing Caribbean 2 VFR Chart.tif [1/1] :
0...10...20...30...40...50...60...70...80...90...100 - done.

Is there a bug fix between 3.3.3 and 3.4.0 that could account for this?

Meanwhile, I'll try to get GDAL 3.4.0 going here.  Thanks,

carl

On Fri, Nov 5, 2021 at 7:51 AM Rahkonen Jukka (MML) <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> Hi,
>
>
>
> Works for me on Windows with GDAL 3.4.0dev and Oct 07 2021 version of the
> file.
>
> gdalwarp -t_srs epsg:4326 "Caribbean 2 VFR Chart.tif" caribbean_4326.tif
>
> Copying color table from Caribbean 2 VFR Chart.tif to new file.
>
> Creating output file that is 18583P x 12118L.
>
> Processing Caribbean 2 VFR Chart.tif [1/1] :
> 0...10...20...30...40...50...60...70...80...90...100 - done.
>
>
>
> The map in caribbean_4326.tif is complete.
>
>
>
> -Jukka Rahkonen-
>
>
>
> *Lähettäjä:* gdal-dev <gdal-dev-bounces at lists.osgeo.org> *Puolesta *Carl
> Godkin
> *Lähetetty:* perjantai 5. marraskuuta 2021 16.25
> *Vastaanottaja:* gdal-dev at lists.osgeo.org
> *Aihe:* [gdal-dev] GeoTIFF gdalwarp puzzle
>
>
>
> Hi,
>
>
>
> I'm working with some aviation charts and found one that behaves in a
> puzzling manner.
>
> This page
> https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/vfr/
>
> has two Caribbean VFR charts in GeoTIFF format.
>
>
>
> I have been trying to run gdalwarp on "Caribbean 2 VFR Chart.tif" but I
> only ever get a small area out of the map instead of the whole extent.
> Specifically this command gives me just a smaller area output GeoTIFF:
>
>
>
> gdalwarp -t_srs EPSG:4326 "Caribbean 2 VFR Chart.tif" out.tif --debug ON
>
>
>
> I don't see anything from the debug output that explains this.
>
>
>
> The other chart, "Caribbean 1 VFR Chart.tif," does not behave this way,
> though the debug output from the same gdalwarp operation is much longer.
>
>
>
> I can't see anything wrong.
>
>
>
> I dragged both files into ArcGIS desktop explorer and both are displayed
> in the proper location and in their entirety.
>
>
>
> (I actually have a more elaborate workflow that works fine with chart #1
> but this is the simplest operation I can think of that shows the problem
> with chart #2.)
>
>
>
> Thank you very much,
>
> carl
>
>
>
>
>
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