[mapserver-users] Re: gradient display of raster DEM data (John
Callahan)
Mark Volz
MarkVolz at co.lyon.mn.us
Mon Nov 21 09:09:32 EST 2011
John,
I was able to get datarange and classrange to work. However I found a couple issues:
1) I had to include an expression for the raster range. - This may have been fixed in newer versions of MS.
2) I was getting unwanted black areas on my map. - I was using PC256 (to make the image smaller), I had to revert to RGB, which has more colors. Mapserver did not report an error when I was using PC256.
CLASS
EXPRESSION ([pixel] >= 1030 AND [pixel] < 1133)
STYLE
COLORRANGE 176 240 232 255 255 179
DATARANGE 1030 1133
END
END #class
Mark Volz
GIS Specialist
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Today's Topics:
1. Re: gradient display of raster DEM data (John Callahan)
----------------------------------------------------------------------
Message: 1
Date: Sat, 19 Nov 2011 13:51:38 -0500
From: John Callahan <john.callahan at udel.edu>
Subject: Re: [mapserver-users] gradient display of raster DEM data
To: "mapserver-users at lists.osgeo.org"
<mapserver-users at lists.osgeo.org>
Message-ID:
<CAL=axXkvjPjKKbY+2FFf0r6Cf8YaRP7ZGmLGvC21GKDnXWMbZQ at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
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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