[OpenLayers-Users] Re: WMS object

[Andreas Hocevar]

On Aug 8, 2011, at 12:45 , Julien Cigar wrote:

> Hi,
> 
> Normally the only thing to do is to use an "SRS" parameter, something like:

This is a common pitfall when using OpenLayers. The SRS parameter will be ignored. Always. Instead, WMS layers will be requested in the SRS used by your base layer.

Andreas.

> 
> var layer = new OpenLayers.Layer.WMS(
> 'YOUR_LAYER_NAME', "http://YOUR_WMS_SERVER', {
>  layers: 'YOUR_LAYER',
>  transparent: true,
>  format: 'image/png',
>  SRS: 'EPSG:3857',
>  SLD: 'http://YOUR_SLD_ADDRESS'
> }, {
>  isBaseLayer: false,
>  singleTile: true,
>  opacity: 0.8,
>  visibility: false
> }
> )
> 
> I don't know which WMS server you use, but if it's Mapserver don't forget to add the supported projections in the WEB METADATA section, something like "wms_srs" "EPSG:4326 EPSG:3857", otherwise it will not work.
> 
> For example:
>    WEB
>        IMAGEPATH "/tmp/"
>        IMAGEURL "/tmp/"
> 
>        METADATA
>            "ows_enable_request"   "*"
> 
>            #######
>            # WMS #
>            #######
> 
>            "wms_title" "my WMS server"
>            "wms_onlineresource" "http://my/wms/address?map=/path/to/mapfile.map&"
>            "wms_srs" "EPSG:4326 EPSG:3857"
>        END
>    END
> 
> Julien
> 
> On 08/08/2011 12:26, Jan Henrik Øverland wrote:
>> How do I request a specific SRS when creating a wms layer?
>> 
>> 
>> On Fri, Aug 5, 2011 at 14:22, Jan Henrik Øverland
>> <janhenrik.overland at gmail.com <mailto:janhenrik.overland at gmail.com>> wrote:
>> 
>>    Hi, my map is EPSG:900913 and running Google Maps nicely. The
>>    following WMS feed is served both as EPSG:4326 and EPSG:900913 (have
>>    a look at the WMS link in the table):
>> 
>>    http://iridl.ldeo.columbia.edu/SOURCES/.USGS/.LandDAAC/.MODIS/.1km/.8day/.version_005/.Aqua/.EAF/.Night/.LST/X+Y+fig-+colors+coasts+-fig+//LST/255./330./plotrange//T/3118./plotvalue/Y/1.5405659E-04/39.99557/plotrange//plotborder+72+psdef//plotaxislength+432+psdef//XOVY+null+psdef/
>> 
>>    When I do this:
>> 
>>    var wms = new OpenLayers.Layer.WMS(
>>    "IRI",
>>    "http://iridl.ldeo.columbia.edu/SOURCES/.USGS/.LandDAAC/.MODIS/.1km/.8day/.version_005/.Aqua/.EAF/.Night/.LST/X+Y+fig-+colors+coasts+-fig+//LST/255./330./plotrange//T/3118./plotvalue/Y/1.5405659E-04/39.99557/plotrange//plotborder+72+psdef//plotaxislength+432+psdef//XOVY+null+psdef/wms.xml",
>>         {
>>            layers: "USGS LandDAAC MODIS 1km 8day version_005 Aqua EAF
>>    Night LST",
>>         }
>>    );
>> 
>>    ..I get a 4326 base layer. But I want it to work with my 900913 map
>>    so I add to the params object:
>> 
>>         {
>>            layers: "USGS LandDAAC MODIS 1km 8day version_005 Aqua EAF
>>    Night LST",
>>            srs: "EPSG:900913",
>>            bbox: "-2000000,1,6900000,4400000"
>>         }
>> 
>>    but it does not work. The getFullRequestString() returns a string
>>    with the correct BBOX, but the SRS it still 4326.
>> 
>>    To me it looks like only the first tile has 900913 and the rest
>>    (twenty-something) have 4326. What am I doing wrong?
>> 
>>    Jan
>> 
>> 
>> 
>> 
>> _______________________________________________
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>> Users at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/openlayers-users
> 
> 
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-- 
Andreas Hocevar
OpenGeo - http://opengeo.org/
Expert service straight from the developers.