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From: Ethan G. <et...@ka...> - 2009-03-20 23:33:32
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Hi, Justin--
Thanks so much, this is exactly what I need!
Have a good weekend.
-- Ethan
At 04:00 PM 3/20/2009, Justin Deoliveira wrote:
>Hi Ethan,
>
>I believe this problem is occurring because you are still using
>geographic coordinates for the bounding box, but specifying the srs
>to the albers projection. To get it right you have to convert the
>bbox coordinates to albers.
>
>Now luckily there is a tool in GeoServer that can help --> the wms
>reflector. It is a convenience for making wms requests that prevents
>you from having to fill out all the parameters. It will also set up
>the bbox parameter in the proper coordinates based on the srs.
>
>So... the following request is the states in geographic (EPSG:4326)
>
>http://localhost:8080/geoserver/wms/reflect?layers=topp:states&format=image/svg+xml
>
>To change to the albers projection just add the srs parameter:
>
>http://localhost:8080/geoserver/wms/reflect?layers=topp:states&format=image/svg+xml&srs=epsg:45556
>
>Or 42303, i tried both and they both worked for me.
>
>If you do need to make the full WMS requests you need to change the
>bbox parameter so its in albers coordinates. For instance:
>
>bbox=-2353760.17599943,-1294266.91959374,2253944.09170884,1561261.68522241&srs=epsg:45556
>
>
>in the request you showed above should get you the results you are
>looking for.
>
>-Justin
>
>
>Ethan Goldstine wrote:
>>Hi--
>>Thanks for your advice.
>>I decided to do another test and take OL out of the equation.
>>I started with this link from the built-in demo:
>>http://localhost:8080/geoserver/wms?bbox=-127.61950064999999,23.7351786,-64.08177035,50.592523400000005&styles=&Format=image/svg%2Bxml&request=GetMap&version=1.1.1&layers=topp:states&width=800&height=317&srs=EPSG:4326
>>
>>That worked.
>>I then changed the srs to 45556 and all I see is Kansas. (It's a
>>peach-colored rectangle labeled KS... not sure if it's the right
>>dimensions of Kansas.)
>>When I change the srs to 42303 I get nothing.
>>Do you see anything strange in the SVG request?
>>-- Ethan
>>
>>At 08:57 PM 3/18/2009, you wrote:
>>>Hi Ethan,
>>>
>>>You may get better luck on the open layers mailing list but a
>>>couple of things I noted.
>>>
>>>I think you have to set the projection property on the wms layer,
>>>rather then the map. I also believe you will have to set the
>>>extent of the layer explicitly as well.
>>>
>>>What version of openlayers are you using. Looking at the WFS
>>>request a few things are off. The first is the SRS parameter, in
>>>wfs this should be SRSNAME. I recognize this problem from a while
>>>back. I think you will get some better results with a more recent
>>>version of OL.
>>>
>>>Also of note is that officially reprojection is not support with
>>>wfs version 1.0, only 1.1. Although GeoServer does support it for 1.0 as well.
>>>
>>>-Justin
>>>
>>>Ethan Goldstine wrote:
>>>>Hi--
>>>>I'm having some difficulty getting GeoServer to do reprojection
>>>>to an Albers Equal Area map. I think the correct codes are EPSG:
>>>>42303 and 45556 (though I could be wrong).
>>>>As a test, I'm using the states data that comes with Geoserver.
>>>>I've tried both WMS and WFS.
>>>>Here's the code:
>>>> var map;
>>>> function init(){
>>>> map = new OpenLayers.Map('map',{projection: new
>>>> OpenLayers.Projection("EPSG:42303")}); // Note that I've also tried 45556
>>>> var political = new OpenLayers.Layer.WMS(
>>>> "State",
>>>> "/geoserver/wms",
>>>> {layers: 'topp:states',
>>>> format: 'image/png'}
>>>> );
>>>>
>>>> var states= new OpenLayers.Layer.WFS(
>>>> "States",
>>>> "/geoserver/wfs",
>>>> {typename: 'topp:states'},
>>>> {
>>>> typename: 'states',
>>>> featureNS: ' http://www.openplans.org/topp',
>>>> extractAttributes: false,
>>>> isBaseLayer: true
>>>> }
>>>> );
>>>> states.style =
>>>> OpenLayers.Util.applyDefaults({strokeColor: "#0000ff"},
>>>> OpenLayers.Feature.Vector.style["default"]);
>>>> map.addLayers([political,states);
>>>>
>>>>I've done testing just showing one layer at a time and here's what happens:
>>>>1. political (WMS) with EPGS: 42303
>>>>Displays nothing. I se a JS error message:
>>>>userAgentButton is null
>>>>_hasString() <??>()OpenLayers.js (line 224)
>>>>OpenLayers.js() <??>()OpenLayers.js (line 223)
>>>>[] var factory=null;if(typeof
>>>>GearsFactory!...documentElement.appendChild(factory);}}}
>>>>
>>>>2. states (WFS) with EPGS: 42303
>>>>Query:
>>>>http://localhost:8080/geoserver/wfs?typename=topp%3Astates&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&SRS=EPSG%3A42303&BBOX=-575,-306.801875,550,361.166875
>>>><http://localhost:8080/geoserver/wfs?typename=topp%3Astates&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&SRS=EPSG%3A42303&BBOX=-575,-306.801875,550,361.166875>
>>>>
>>>>I see the state outlines but it's not an Albers projection.
>>>>3. political (WMS) with EPGS: 45556
>>>>I see the same JS error as in case 1, query to the db happens and
>>>>I only see Kansas.
>>>>Note that if I remove the projection from OpenLayer.Map(... it works fine.
>>>>4. states (WFS) with EPGS: 45556
>>>>Query:
>>>>http://localhost:8080/geoserver/wfs?typename=topp%3Astates&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&SRS=EPSG%3A45556&BBOX=-575,-306.801875,550,361.166875
>>>><http://localhost:8080/geoserver/wfs?typename=topp%3Astates&SERVICE=WFS&VERSION=1.0.0&REQUEST=GetFeature&SRS=EPSG%3A45556&BBOX=-575,-306.801875,550,361.166875>
>>>>
>>>>Same as case 2, no Albers projection.
>>>>Any help and advice is greatly appreciated.
>>>>-- Ethan
>>>>Ethan Goldstine
>>>>Producer, kapow, inc.
>>>>et...@ka...
>>>>
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>>>
>>>
>>>--
>>>Justin Deoliveira
>>>OpenGeo - http://opengeo.org
>>>Enterprise support for open source geospatial.
>>Ethan Goldstine
>>Producer, kapow, inc.
>>et...@ka...
>>310.394.5276 (394-KAPOW)
>
>
>--
>Justin Deoliveira
>OpenGeo - http://opengeo.org
>Enterprise support for open source geospatial.
Ethan Goldstine
Producer, kapow, inc.
et...@ka...
310.394.5276 (394-KAPOW)
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