[mapserver-users] WCS layer units question...

[Carl Godkin]

Thanks for the reply, Jukka.

I found "wcs_band_uom" in the docs but I can't seem to make the value I put
into my map file appear in the DescribeCoverage output.  (The link you sent
doesn't work for me.)

I do see this though:

<swe:field name="band">
<swe:Quantity>
<swe:nilValues/>
<swe:uom code="W.m-2.Sr-1"/>
<swe:constraint>
<swe:AllowedValues>
<swe:interval>-3.4028e+38 3.4028e+38</swe:interval>
<swe:significantFigures>12</swe:significantFigures>
</swe:AllowedValues>
</swe:constraint>
</swe:Quantity>
</swe:field>

The "swe:uom code" would seem to be what I want to affect.  For some reason
I see the value "watts per square meter per steradian" which appears
nowhere in my map file so I wonder if it's some sort of default baked into
the code or something.  (I had seen that before but hadn't bothered to try
to figure out what it was until just now.  That's weird.)

Thanks for your help,

carl



On Tue, Jan 11, 2022 at 11:57 PM Rahkonen Jukka (MML) <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> Hi,
>
>
>
> WCS users are supposed to read the metadata with DescribeCoverage, for
> example
> https://avoin-visukuva.nls.fi/ortokuvat-ja-korkeusmallit/wcs/v1?service=WCS&version=2.0.1&request=DescribeCoverage&coverageID=ortokuva_vari
>
> The units can be configured in the mapfile with “wcs_band_uom”. I do not
> know if it is possible to configure the outputformat to write uom also into
> the TIFF. That is something that GDAL should do.
>
>
>
> -Jukka Rahkonen-
>
>
>
>
>
>
>
> *Lähettäjä:* MapServer-users <mapserver-users-bounces at lists.osgeo.org> *Puolesta
> *Carl Godkin
> *Lähetetty:* keskiviikko 12. tammikuuta 2022 3.58
> *Vastaanottaja:* Mapserver-Users (mapserver-users at lists.osgeo.org) <
> mapserver-users at lists.osgeo.org>
> *Aihe:* [mapserver-users] WCS layer units question...
>
>
>
> Hi,
>
>
>
> I have a local WCS & WMS server.
>
>
>
> I am trying to figure out if I can somehow define the Z units of a terrain
> layer I'm serving.
>
>
>
> The single band from the individual GeoTIFF files providing the terrain
> data looks like this (from gdalinfo):
>
>
>
> Band 1 Block=512x512 Type=Float32, ColorInterp=Gray
>   Description = Layer_1
>   NoData Value=-999999
>   Unit Type: m     <===================================== units are meters
>   Metadata:
>     LAYER_TYPE=athematic
>     RepresentationType=ATHEMATIC
>
>
>
> but when I download a GeoTIFF using a WCS GetCoverage request on this
> layer, the GeoTIFF's single band just looks like this:
>
>
>
> Band 1 Block=571x3 Type=Float32, ColorInterp=Gray
>
>
>
> without "Unit Type."
>
>
>
> I also tried using
>
>    UNITS Meters
>
> in my LAYER definition in my map file (copying an example I found among
> the case studies on the web site) but it didn't seem to have any effect.
>
>
>
> Is there some way to define and retrieve the Z units for a WCS server?
>
>
>
> Thanks very much.
>
>
>
> carl
>
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