[mapserver-users] mapserver wms: srs problem

[Jeff McKenna]

Maybe you could attach your entire .map file for the mailing list  to  
see.


---
Jeff McKenna
FOSS4G Consulting and Training Services
http://www.gatewaygeomatics.com/





On 9-Jun-08, at 4:44 PM, Matthew Pettis wrote:

> Hi Barend, All,
>
> I tried your suggested changes:
> ====================================================
> ...
>  PROJECTION
>    "init=epsg:4326"
>  END
>
>    ####################
>    # Web settings
>    ####################
>  WEB
>    IMAGEPATH   "C:/ms4w/Apache/htdocs/tmp/"
>    IMAGEURL    "/tmp/"
>    METADATA
>        "wms_title"           "WMS Demo Server"
>        "wms_onlineresource"
> "http://localhost/cgi-bin/mapserv.exe?center=45,-95&zoom=6"
>        "wms_srs"             "EPSG:4326 EPSG:26915"
>    END
>  END
>
>    ####################
>    # State
>    # Background shows through missing precincts to show where no
> votes will be coming from
>    ####################
>  LAYER
>    NAME              "state"
>    METADATA
>        "wms_title"   "state"
>        "wms_format" "image/png"
>    END
> ...
> ====================================================
>
> Now, the map is blank (no error messages either).  It looks like i can
> drag and zoom per the controls, but there is no image of the state of
> MN to move around.  Any idea what could still be the matter?
>
> Thanks,
> Matt
>
>
> On Sun, Jun 8, 2008 at 1:08 PM, Barend Kobben <kobben at itc.nl> wrote:
>> It looks like your datastore's SRS is 4326 (latlon on the WGS84).  
>> In other
>> words, the data in your shapefile, database or raster image are (or  
>> are
>> advertised to be) in 4326. Its because your data is indeed in that  
>> srs
>> and/or advertised as such in the Mapfile LAYER as
>>
>>         PROJECTION
>>            "init=epsg:4326"
>>         END
>>
>> But you tell the WMS interface that the layer is in 26915, by  
>> setting layer
>> metadata srs => EPSG:26915
>>
>> If you want MS to reproject your data from 4326 to 26915 upon  
>> request, make
>> sure you set the layerdata projection:
>>       PROJECTION
>>            "init=epsg:4326"
>>         END
>>
>> Then make sure you tell the WMS interface to advertise it can be  
>> reprojected
>> to 26915 by setting it in web metadata srs:
>>   "wms_srs" "EPSG:4326 EPSG:26915 EPSG:[others you want to offer]"
>>
>> AFAIK there no wms_srs metadata in the LAYER object...
>>
>>
>> --
>> Barend Köbben
>> International Institute for Geo-Information
>> Sciences and Earth Observation (ITC)
>> PO Box 6
>> 7500AA Enschede, The Netherlands
>> +31 (0)53 4874253
>>
>>
>>
>>
>>
>> On 08-06-08 02:21, "Matthew Pettis" <matthew.pettis at gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I am not a GIS guy, and am a bit confused by the projection  
>>> attributes
>>> i have to specify in mapserver.  In particular, I have a simple
>>> example.  I have a map that has the following metadata:
>>>
>>> Horizontal Coordinate Scheme     UTM
>>> Ellipsoid  GRS80
>>> Horizontal Datum  NAD83
>>> Horizontal Units  Meters
>>> UTM Zone Number  15
>>>
>>> I believe this translates to an epsg=26915
>>>
>>> Now, according to mapserver, I have to specify a projection  
>>> object, a
>>> web metadata srs, and a layer metadata srs.
>>>
>>> To compress the mapfile, i'll just note what i have specified for  
>>> each
>>> of these settings.
>>>
>>> First, I would think that this would work:
>>>
>>> projection => init=epsg:26915
>>> web metadata srs => EPSG:26915
>>> layer metadata srs => EPSG:26915
>>>
>>> this give me the error:
>>> msWMSLoadGetMapParams(): WMS Server Error. Invalid SRS given.  SRS
>>> must be valid for all requested layers.
>>>
>>> I only have the one layer (it's of the state of MN from www.gis.leg.mn 
>>> ).
>>>
>>> However, the following renders, but I don't think it is the  
>>> projection
>>> i want (as the top of MN is too wide):
>>>
>>> projection => init=epsg:26915
>>> web metadata srs => EPSG:26915
>>> layer metadata srs => EPSG:4326
>>>
>>> Now, I am using mapserver as a WMS.  Before I was using it NOT as a
>>> WMS, but just making it render the shapefile without any projection
>>> information, it worked, and it was the projection I had come to  
>>> expect
>>> when seeing the state of MN rendered.
>>>
>>> Why does my first configuration give me an error?
>>> How can I make it render in the way I expect without giving  
>>> mapserver
>>> explicit projection instructions?
>>>
>>> please forgive the ignorance of map projection knowledge.
>>>
>>> thanks,
>>> matt
>>
>> International Institute for Geo-Information Science and Earth  
>> Observation (ITC)
>> Chamber of Commerce: 410 27 560
>>
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>
>
>
> -- 
> It is from the wellspring of our despair and the places that we are
> broken that we come to repair the world.
> -- Murray Waas
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