[gdal-dev] Problem generating a tif, vrt and displaying it via mapserver

[Stephen Woodbridge]

Argh! I started this thread saying I probably was doing something stupid 
or missing something obvious and I was right!
Seth, Thank you for your support and suggestions, they lead me to the 
problem which was the fact that somewhere along the line some filenames 
changed and CONFIG ON_MISSING_DATA "IGNORE" masked that problem.

So things are working as expected after fixing file names and few other 
minor computational issues.

Thank you all for this wonderful software suite!

-Steve W



On 5/30/2025 3:37 AM, Seth G wrote:
> HI Steve,
>
> Yes, it is the MapServer logs that might have something useful. You 
> can also increase the LAYER logging and add in GDAL logging by adding 
> the following to the Mapfile:
>
>   CONFIG "CPL_DEBUG" "ON"
>   CONFIG "PROJ_DEBUG" "ON"
>   DEBUG 5
>    LAYER
>       DEBUG 5
>
> I wouldn't worry too much about the querying until you can see output 
> in the map. I'd probably try a few things to narrow it down:
>
> - does the LAYER work if you switch the data to the ssh layer?
> - does the LAYER work if you use the image directly without the .vrt?
> - maybe get the EXTENT from QGIS or GDAL in EPSG:4326 and add the 
> EXTENT to the layer.
>
> In my experience, blank layers are usually related to extent or 
> projection, but it could be something else.
>
> Seth
>
> --
> web:https://geographika.net & https://mapserverstudio.net
> mastodon: @geographika at mastodon.social
>

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