[mapserver-users] Obtaining range values from GDAL stats

[Even Rouault]

On lundi 6 août 2018 17:59:03 CEST Daniel Baston wrote:
> Hello,
> 
> Is it possible to scale a raster based on min and max values determined on
> a per-file basis, rather than a per-layer or per-WMS-request basis? I have
> a layer that reads data from one of many possible GeoTIFFs, depending on
> variables that are provided as query-string parameters. Each file has
> different ranges of values, so I can't manually specify a scaling range
> with PROCESSING "SCALE_1=200,400" or the like. But if I use PROCESSING
> "SCALE=AUTO" then a range is determined for each request, which produces
> discontinuities when clients generated tiled requests.
> 
> Is it possible for MapServer to load raster min and max values from
> statistics written by GDAL to raster metadata, or is there some other way
> to solve the problem?

You could create a VRT that would already by rescaled with
gdal_translate -scale

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