[mapserver-users] WMS: raster's x and y pixel dimension

[Rahkonen Jukka]

Hi,

Width, height and BBOX are all compulsory parameters in WMS GetMap
request and Mapserver is sending an image according to the request.  If
you want to be able to control the pixel size easily, without making WMS
client to balance the BBOX and image size in pixels, consider using WCS.
One way to make a WCS request is 

http://server.fi/cgi-bin/mapserver_wcs?SERVICE=WCS&VERSION=1.0.0&REQUEST
=GetCoverage&COVERAGE=DEM&FORMAT=image/tiff&CRS=EPSG:3067&ResX=1.0&ResY=
1.0&BBOX=533652,6973434,534658,6974219

You can see parameters ResX and ResY which are used for controlling the
pixel size.

-Jukka Rahkonen-

fla83tn wrote:

> 
> Hi to all,
> I've a problem with the loading of  a raster image via WMS (1.3.0).
> 
> To load the layers of my project I use gvSIG. If I load my 
> digital elevation model (DEM) directly from filesystem (which 
> is a HFA/Erdas Image file - .img), 
> 
> x and y pixel dimension are fixed to 2.5 and -2.5 meters 
> respectively, and fixed are also the width and height attributes.
> If I load the layer from
> Mapserver's WMS instead, x and y pixel dimension change as I 
> zoom in or out (i.
> e. changing the width
> and height parameters of the getMap request). 
> Is there
> the possibility to tell the wms client that x and y pixel 
> dimension are constant and should never be calculated?
> 
> Here's my layer definition and the
> tiff outputformat definition:
> 
> OUTPUTFORMAT
>   NAME GTiff
>   DRIVER "GDAL/GTiff"
> 
>   MIMETYPE "image/tiff"
>   IMAGEMODE FLOAT32
>   EXTENSION "tif"
> END
> 
> LAYER
>   NAME
> "my_dem"
>   EXTENT 669913.75 5143998.75 678313.75 5150701.25
> 	
>   METADATA
>     
> "wms_title"    "my_dem"   ##required
>     "wms_extent" "669913.75 5143998.75
> 678313.75 5150701.25"
>     "gml_include_items" "all"
>   END
>   TYPE RASTER
>   
> STATUS ON
>   PROJECTION
>          "init=epsg:25832"
>   END  
> 
>   DATA "my_dem.tiff"
> 
>   PROCESSING "NODATA=-9999"
>   PROCESSING "SCALE=227.23,1741.15"
>   PROCESSING
> "SCALE_BUCKETS=2000"
>   PROCESSING "BANDS=1"
>   
>   DEBUG on
>   DUMP 	true
>   
> TEMPLATE "void" # enable queryable attribute on the layer END
> 
> Any help is
> appreciated,
> Flavio
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