[mapserver-users] GDAL WMS

[Robert Sanson]

Hi JAmes
 
I believe sizex,sizey refers to the size a given pixel represents on the ground. eg. a 1:25,000 scale orthophoto may be represented with each pixel = 2.5m on the ground.
 
Here is an example from my mapfile:
 
 LAYER
  NAME nz50ktm
  GROUP "Toposcans"
  TYPE RASTER
  STATUS ON
  CONNECTION "http://ws-esrimt/arcgis/services/mapservice_topography_raster/MapServer/WMSServer?"
  CONNECTIONTYPE WMS
  MAXSCALE 60000
  MINSCALE 10000
  
  METADATA
   # OGC:WMS specific tags
   "ows_title"    "NZ 1:50k scale NZTM"
   "ows_abstract"    "This layer came from the LINZ Topo50 series maps in NZTM"
   "WMS_FORMAT" "image/png"
   "wms_server_version" "1.1.1"
   "wms_opaque"    "1"
   "wms_group_title" "Toposcans"
   "wms_resx" "4.233"
   "wms_resy" "4.233"
   "ows_extent" "1083997.88 4722000.45 2092003.23 6234002.12"
   "wms_srs"   "EPSG:2193"
   "WMS_NAME" "3"
   "wms_exceptions_format" "application/vnd.ogc.se_xml"
  END
 END

Regards,
 
Robert S

>>> James Perrins <james.perrins at gmail.com> 16/03/2010 2:51 a.m. >>>
Thanks Tamas - but I'm still confused..

With a WMS call I can specify the BlockSize - which I believe controls
the size of the tiles that I get back from the WMS service

If I have set blocksize to be 256 then if I am requesting a WMS image
to fill a 512x512 space on the screen and I have the
OVERSAMPLING_RATIO=1 - I would expect it to request 4 to 9 256x256
tiles (depending on how aligned it was)

"SizeX,SizeY corresponds to the raster dimensions in pixels" -
- is this the raster of the source image (the WMS is vector so this
doesn't make much sense to me?)
- or is it the size of the image produced - which is a series of
256x256 tiles stitched together to whatever size I have requested
through mapserver - so again it doesn't make much sense to me to
define this in the xml file - as it will change as my window resizes.

If talking about a tileserver - e.g OpenStreetMap - what is the
SizeX,Y then - the size of the source raster at its maximum resolution
?

Sorry if these are silly questions - but I'm clearly missing some bit
of basic understanding here

Many Thanks
James

On Mon, Mar 15, 2010 at 12:15 PM, Tamas Szekeres <szekerest at gmail.com> wrote:
>
>
> 2010/3/15 James Perrins <james.perrins at gmail.com>
>>
>> Do you know what the SizeX does for WMS as well ?
>>
>
> SizeX,SizeY corresponds to the raster dimensions in pixels
>
> Best regards,
>
> Tamas
>
>
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