[gdal-dev] Hints that a raster band represents a DEM?

[Even Rouault]

Hi Nyall,

you didn't miss anything. There's no standardized metadata to figure out 
if a band is DEM. A few drivers (at least USGSDEM, DTED, SRTMHGT, BLX, 
BT, Leveller, Terragen, SIGDEM, HF2) convey exclusively height related 
data, but most others can convey anything, often without a 
distinctive/normalized way of identifying the nature of the data.

Even

Le 30/04/2022 à 03:10, Nyall Dawson a écrit :
> Hi list,
>
> I'm looking for any tips on potential approaches I could use to
> automagically guess that a particular band from a data source
> represents an elevation surface.
>
> I haven't been able to find any common metadata components in the
> files I've investigated which could help indicate this, but maybe I'm
> missing something. Right now the best approach I can think of would be
> to test if the layer's CRS has a vertical component (but unfortunately
> even among DEM layers I think this will be rare!).
>
> Any suggestions?
> Nyall
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