<div dir="ltr"><div><div><div>Arnd,<br><br>I'm talking about lines 247-251 from wms.js (<a href="https://github.com/openlayers/openlayers/blob/master/lib/OpenLayers/Layer/WMS.js">https://github.com/openlayers/openlayers/blob/master/lib/OpenLayers/Layer/WMS.js</a>):<br>
<br>var mapProjection = this.map.getProjectionObject();<br>var projectionCode = this.projection && this.projection.equals(mapProjection) ? this.projection.getCode() : mapProjection.getCode();<br>var value = (projectionCode == "none") ? null : projectionCode;<br>
<br></div>If the layer projection equals the mapprojection, the layer projection is returned. If not, the mapprojection is returned.<br><br></div>Correct me if I'm wrong, but that would say it always returns the map projection code, no matter what I fill in on the projection code or when I fill it.<br>
<br></div><div>I came across this piece of code after building a WMS server with SharpMap. I only built in support for EPSG:3857 but the default OSM layer is in EPSG:900913. My WMS server kept coming with error "SRS 900913 not supported"<br>
</div><div>Please note that in my case the WMS layer is NOT my base layer. If it was, it WOULD listen to the projection of the layer (as the Map.Projection asks it's baselayer for the projection)<br></div><div><br></div>
Casper<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Jan 16, 2013 at 11:13 PM, Arnd Wippermann <span dir="ltr"><<a href="mailto:arnd.wippermann@web.de" target="_blank">arnd.wippermann@web.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>
<div>
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial">Hi Caspar,</font></span></div><div class="im">
<div dir="ltr" align="left"><span><font color="#0000ff" face="Arial"></font></span> </div>
<div dir="ltr" align="left"><span>"</span>In other words,
it will only use the map projection in it's WMS request URL's<span>"</span></div>
<div><span></span> </div>
</div><div><span><font color="#0000ff" face="Arial">That's
not right as you have found out by yourself. If the map projection is equal the
wms projection, then the WMS GetMap Request use the wms
projection.</font></span></div>
<div><font color="#0000ff" face="Arial"></font> </div>
<div><span></span><font face="Arial"><font color="#0000ff"><font>S<span>ome servers provide
only requests for EPSG:3857 (an alias for EPSG:900913) and if you use for your
map EPSG:900913, then you can add these servers and set the projection to
EPSG:3857 and it works.</span></font></font></font></div>
<div><font face="Arial"><font color="#0000ff"><font><span></span></font></font></font> </div>
<div><font face="Arial"><font color="#0000ff"><font><span>But it seems, that that only works for EPSG:900913 and
EPSG:4326 and their aliases, because OpenLayers has aliases defined in
OpenLayers Projection.js.</span></font></font></font></div>
<div><font face="Arial"><font color="#0000ff"><font><span></span></font></font></font> </div>
<div><font face="Arial"><font color="#0000ff"><font><span>If you have maps with other projections and a server
support only an alias of the projection, then the above will perhaps not
work.</span></font></font></font></div>
<div><font face="Arial"><font color="#0000ff"><font><span></span></font></font></font> </div>
<div><font face="Arial"><font color="#0000ff"><font><span>Then the only way is to overwrite the
getFullRequestString-method of
OpenLayers.Layer.WMS.</span></font></font></font></div>
<div><font face="Arial"><font color="#0000ff"><font><span></span></font></font></font> </div>
<div><font face="Arial"><font color="#0000ff"><font><span>Example</span></font></font></font></div>
<div><font face="Arial"><font color="#0000ff"><font><span><a href="http://gis.ibbeck.de/ginfo/apps/OLExamples/OL212/wms_options_projection.asp" target="_blank">http://gis.ibbeck.de/ginfo/apps/OLExamples/OL212/wms_options_projection.asp</a></span></font></font></font></div>
<div><font face="Arial"><font color="#0000ff"><font><span></span></font></font></font> </div>
<div><font face="Arial"><font color="#0000ff"><font><span>Arnd</span></font></font></font></div>
<div><br></div><br>
<div dir="ltr" align="left" lang="de">
<hr>
<font face="Tahoma"><b>Von:</b> <a href="mailto:openlayers-users-bounces@lists.osgeo.org" target="_blank">openlayers-users-bounces@lists.osgeo.org</a>
[mailto:<a href="mailto:openlayers-users-bounces@lists.osgeo.org" target="_blank">openlayers-users-bounces@lists.osgeo.org</a>] <b>Im Auftrag von </b>Casper
Span<br><b>Gesendet:</b> Mittwoch, 16. Januar 2013 12:53<br><b>An:</b>
Sergeant_york<br><b>Cc:</b> <a href="mailto:openlayers-users@lists.osgeo.org" target="_blank">openlayers-users@lists.osgeo.org</a><br><b>Betreff:</b>
Re: [OpenLayers-Users] epsg:3857 and google 900913<br></font><br></div><div><div class="h5">
<div></div>
<div dir="ltr">
<div>
<div>
<div>
<div>
<div>
<div>Hi,<br><br></div>If you look at the source of WMS
(lib\OpenLayers\Layer\WMS.js), take a look at getFullRequestString.<br></div>In
it, the baselayer's projection will always override the given projection. In
fact, the layers projection itself will be ignored:<br></div>- It takes the Map
Projection (=Baselayer projection)<br></div>- then, if the WMS layer projection
equals the map projection, it uses the layer projection<br></div>- otherwise, it
uses the map projection<br><br></div>In other words, it will only use the map
projection in it's WMS request URL's<br>
<div>
<div>
<div>
<div><br>So yeah... everything MUST be the same projection for WMS layers or it
cannot be placed on top of eachother.<br>
<div class="gmail_extra"></div>
<div class="gmail_extra">For me, this meant reprojecting my own data so I can
serve it with WMS onto OSM.<br><br></div>
<div class="gmail_extra">You can check these actual outgoing URL's with Firebug
and such.<br><br></div>
<div class="gmail_extra">regards,<br></div>
<div class="gmail_extra">Casper Span<br></div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Jan 16, 2013 at 12:31 PM, Sergeant_york <span dir="ltr"><<a href="mailto:electronicpanda@gmail.com" target="_blank">electronicpanda@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">Hello there,<br><br>Thank you for the answer. That gave me a
good idea. Unfortunately it doesn't<br>work when initializing layer.<br><br>On
the other hand creating a layer (for example aLayer object) then
changing<br>projection works!<br><br>Workin way is:<br>layer aLayer=new
OpenLayers.Layer.WMS ......<br>aLayer.projection= new
OpenLayers.Projection("EPSG:3857")<br><br><br><br>--<br>View this message in
context: <a href="http://osgeo-org.1560.n6.nabble.com/epsg-3857-and-google-900913-tp5027619p5027809.html" target="_blank">http://osgeo-org.1560.n6.nabble.com/epsg-3857-and-google-900913-tp5027619p5027809.html</a><br>
<div>
<div>Sent from the OpenLayers Users mailing list archive at
Nabble.com.<br>_______________________________________________<br>Users
mailing list<br><a href="mailto:Users@lists.osgeo.org" target="_blank">Users@lists.osgeo.org</a><br><a href="http://lists.osgeo.org/mailman/listinfo/openlayers-users" target="_blank">http://lists.osgeo.org/mailman/listinfo/openlayers-users</a><br>
</div></div></blockquote></div><br><br clear="all"><br>-- <br><br>Casper Span<br>T: <a href="https://twitter.com/#%21/Span_Droid" target="_blank">@Span_Droid</a><br>W:
<a href="http://www.spatially-oriented.com" target="_blank">http://www.spatially-oriented.com</a><br>M: <a href="mailto:info@spatially-oriented.com" target="_blank">info@spatially-oriented.com</a><br><br></div></div></div>
</div></div></div></div></div></div>
</blockquote></div><br><br clear="all"><br>-- <br><br>Casper Span<br>T: <a href="https://twitter.com/#%21/Span_Droid" target="_blank">@Span_Droid</a><br>W: <a href="http://www.spatially-oriented.com" target="_blank">http://www.spatially-oriented.com</a><br>
M: <a href="mailto:info@spatially-oriented.com" target="_blank">info@spatially-oriented.com</a><br><br>
</div>