[mapserver-users] gradient display of raster DEM data

[John Callahan]

Thanks again for the idea of using multiple classes but I can't seem to get
it to work.  Has anyone else had success with this method?  It seems as
though it's applying only the first defined COLORRANGE to full range of the
values in the dataset.

I've tried using the below syntax (only COLORRANGE and DATARANGE in each
CLASS) as well as the (proposed?) block syntax as defined at
http://mapserver.org/development/rfc/ms-rfc-6.html  (which gives me errors
for RANGEITEM and invalid hex color for MINCOLOR.)

I am using MapServer 6.0.1 as part of MSW 3.0.3.

Incorrect image being displayed: http://i44.tinypic.com/2hdwuuu.jpg

Correct image, created through QGIS: http://i42.tinypic.com/21d2x5h.jpg


Here is the LAYER portion of my map file. Is there anything obvious I
should change?   Thanks for any suggestions.

***********
  LAYER
    NAME 'de_dem2m'
    TYPE RASTER
    DATA 'C:\data\delaware2m.img'
PROCESSING "CLOSE_CONNECTION=DEFER"
EXTENT 166773.496 49314.974 233217.496 204730.974
    METADATA
      'ows_title' 'Delaware DEM'
   INCLUDE "ogc_projections.map"
      'wms_include_items'   'all'
    END
    STATUS ON
DUMP TRUE
    TRANSPARENCY 100
    PROJECTION
      "init=epsg:26957"
    END

  CLASS
   STYLE
      COLORRANGE 170 230 209 255 255 179
      DATARANGE 0.0 7.0
   END
  END

  CLASS
   STYLE
      COLORRANGE 255 255 179 0 128 64
      DATARANGE 7.01 11.0
   END
  END

  CLASS
   STYLE
      COLORRANGE 0 128 64 252 186 3
      DATARANGE 11.01 14.0
   END
  END

  CLASS
   STYLE
     COLORRANGE 252 186 3 199 15 2
     DATARANGE 14.01 20.0
   END
  END
  CLASS
   STYLE
      COLORRANGE 199 15 2 105 48 13
      DATARANGE 20.01 40.0
   END
  END

  CLASS
   STYLE
      COLORRANGE 105 48 13 171 171 171
      DATARANGE 40.01 100.0
   END
  END

  CLASS
   STYLE
      COLORRANGE 171 171 171 232 230 232
      DATARANGE 100.01 140.0
   END
  END

  END
*********************

- John

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



On Mon, Oct 17, 2011 at 3:05 PM, Smith, Michael ERDC-CRREL-NH <
Michael.Smith at usace.army.mil> wrote:

>  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>
> Date: Mon, 17 Oct 2011 14:54:13 -0400
> To: "mapserver-users at lists.osgeo.org" <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
>
>
>
> On Fri, Oct 14, 2011 at 5:49 PM, Smith, Michael ERDC-CRREL-NH <
> 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>
>> Date: Fri, 14 Oct 2011 16:55:59 -0400
>>
>> To: <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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