[mapserver-users] gradient display of raster DEM data

[Smith, Michael ERDC-CRREL-NH]

John,

I got a larger color range by using multiple classes

LAYER
  NAME "hillshade"
  TYPE raster
  TILEINDEX "/benchmarking/wms/2011/data/raster/DEM/bil_16int/dem_bil16int.shp"
  PROCESSING "CLOSE_CONNECTION=DEFER"
  PROJECTION
       "+init=epsg:4326"
  END
  CLASS
    STYLE
      COLORRANGE  46 154 88 251 255 128
      DATARANGE   1003 1800
    END
  END
  CLASS
    STYLE
      COLORRANGE  251 255 128 224 108 31
      DATARANGE   1800 2800
    END
  END
 CLASS
    STYLE
      COLORRANGE   224 108 31  200 55 55
      DATARANGE    2800 3500
    END
  END
  CLASS
    STYLE
      COLORRANGE  200 55 55  215 244 244
      DATARANGE   3500 4397
    END
  END
END


From: John Callahan <john.callahan at udel.edu<mailto:john.callahan at udel.edu>>
Date: Mon, 17 Oct 2011 14:54:13 -0400
To: "mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>" <mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>>
Subject: Re: [mapserver-users] gradient display of raster DEM data

Thanks for all your responses.  I have COLORRANGE / DATARANGE working fine in my map file. Works very well.  I'm also looking at using gdaldem for a more custom color scale.  Thanks again.

- John

***********************************************
John Callahan, Research Scientist
Delaware Geological Survey, University of Delaware
URL: http://www.dgs.udel.edu
*************************************************



On Fri, Oct 14, 2011 at 5:49 PM, Smith, Michael ERDC-CRREL-NH <Michael.Smith at usace.army.mil<mailto:Michael.Smith at usace.army.mil>> wrote:
John

The DATARANGE / COLORRANGE keywords will be fully documented by 6.2 but they have been present in MapServer for years (since 4.6 or so).

We used DATARANGE / COLORRANGE for dem display in this years FOSS4G WMS Benchmarking effort.

Mike

--
Michael Smith
US Army Corps
Remote Sensing GIS/Center

From: John Callahan <john.callahan at udel.edu<mailto:john.callahan at udel.edu>>
Date: Fri, 14 Oct 2011 16:55:59 -0400

To: <mapserver-users at lists.osgeo.org<mailto:mapserver-users at lists.osgeo.org>>
Subject: [mapserver-users] gradient display of raster DEM data

I know this has been asked before but I thought I'd ask to see if anything changed.

I'm looking to display a raster digital elevation model in mapserver.  My data is in flat files, img and tiff.  I'd like to display this data as a continuous gradient color range, rather than using CLASS categories/bins for specific colors.  Is it still tru ethat this is not possible, easily?

One method (passed to me on this list) was too generate the colored image I want in another program, using GMT or similar tool, then use that in mapserver.  This seems like the best option but is non-trivial to someone who hasn't done this before.  (though not terribly difficult.)

I also read about the use of DATARANGE and COLORRANGE in mapserver.  However, these are not in the documentation.  Are these available in trunk only?  A ticket was generated that seems to say this will be included with MS 6.2.  (http://trac.osgeo.org/mapserver/ticket/1305)  Any insight on whether this is still the plan?


Thanks for your help and advice.

- John

***********************************************
John Callahan, Research Scientist
Delaware Geological Survey, University of Delaware
URL: http://www.dgs.udel.edu
*************************************************

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