[gdal-dev] GeoTIFF gdalwarp puzzle

[Rahkonen Jukka (MML)]

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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