[mapserver-users] Point query from Mapserver raster

[Carl Godkin]

Hi,
Now that I have my WMS and WCS servers working well (thanks, list!!), I
have one more thing I would like to figure out how to do.

I want to do point queries on [Lat,Lon] points for their elevation from the
terrain layer I have.

I have done some searching and come across various ideas such as Raster
Query (https://mapserver.org/input/raster.html#raster-query) and a query
template  (
https://gis.stackexchange.com/questions/167239/mapserver-raster-picking-elevation-data)
but haven't found enough information for either to implement it.

I came up with a solution that works fine, but might be considered as going
"All Around the Barn"   What works is to add an ASCII output format to my
map file that serves terrain like this:

    OUTPUTFORMAT
      NAME XYZ
      DRIVER "GDAL/XYZ"
      MIMETYPE "text/plain"
      IMAGEMODE FLOAT32
      EXTENSION "txt"
    END

and then use GetCoverage on a small rectangle whose lower-left corner
is the point whose elevation I want:

http://localhost:8080/wcs?SERVICE=WCS&VERSION=2.0.1&REQUEST=GetCoverage&coverageid=SRTM_3_arc-second_grid&format=XYZ&subset=Lat(42.948,42.958)&subset=Lon(-122.086,-122.076)

and then take the first line of the returned output file.

What would Mapserver best practice be for a problem like this?

Thanks very much,

carl
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