how about using GeoJSON?
__________________________________________________________________________________________ Piensa en el medio ambiente - mantenlo en la pantalla. NO lo imprimas si NO es necesario. Think green - keep it on the screen. Do NOT print if it is NOT necessary. Denken Sie an die Umwelt - bewahren Sie es auf dem Bildschirm. Drucken Sie es NICHT, wenn es NICHT notwendig ist. > To: > From: [email protected] > Date: Mon, 11 Mar 2013 16:13:42 -0500 > CC: [email protected] > Subject: Re: [OpenLayers-Users] Coordinates Reversed > > > To help it would be useful to know the WFS version and server-side vendor and > implementation you are attempting to utilize. > > The easiest thing would be to use WFS 1.0 with GML2. You'll (usually) get > back geographic coordinates in [lon, lat] > > The longer gist-of-it-but-skipping-details explanation: > > There's some ambiguity as to what the axis ordering should be. Computer-folk > tend to prefer [x, y] or [lon, lat] and this was how the computer-folk > implemented these services for a long time. The reality is that the > authorities that define the coordinate systems (i.e. the "EPSG" in > "EPSG:4326") define the proper axis order for coordinates. As an example > for EPSG:4326 the authority defined axis order is [lat, lon] == [y, x] == > [north, east]. The purists brought up this discrepancy and in 2009 the OGC > put forth this guidance note: http://www.ogcnetwork.net/node/491. What this > says that any specification generated after 2009 (and implementations of > those specifications) must respect the authority defined axis order (i.e. > [lat, long] not [lon, lat]). Now this is all muddled because vendors have > put forth varying degrees of compliance in the implementations of these newer > services. There a number of nuances to all of this and it's usually easier > (if possible) to use servi > ces that pre-date the 2009 upheaval (where everything was in the incorrect, > but consistent axis order). > > Tom > > > On Mar 11, 2013, at 2:57 PM, Jerome A. Wendell <[email protected]> > wrote: > > > I have setup a vector layer based on features from a WMS layer that are > > filtered by an argument in the url used to call up the map. The feature is > > being found and shows up in the POST response in Firebug, but does not show > > up on the map. My first thought was the feature needed to be transformed, > > so I added that. In looking at the response in Firebug for the feature, > > the latitude is listed before the longitude. This appears to be my problem > > because the coordinates listed for the feature in the DOM in Firebug are > > not realistic (contain NaN a number of times). The code for that part of > > my map is below: > > var args = OpenLayers.Util.getParameters(); > > var filter = new > > OpenLayers.Filter.Comparison({ > > type: > > OpenLayers.Filter.Comparison.EQUAL_TO, > > property: 'attribute', > > value: args['attribute'] > > }); > > var selvectorLayer = new > > OpenLayers.Layer.Vector("Selected Tract", { > > strategies: [new > > OpenLayers.Strategy.Fixed()], > > protocol: new > > OpenLayers.Protocol.WFS.fromWMSLayer(mylayer), > > styleMap: mystyles, > > filter: filter, > > displayInLayerSwitcher: > > false, > > isBaseLayer: false, > > visibility: true, > > eventListeners: { > > beforefeatureadded: > > function(event) { > > > > event.feature.geometry.transform(new > > OpenLayers.Projection('EPSG:4326'),this.map.getProjectionObject()); > > } > > } > > }); > > The WMS layer is in EPSG:4326, and the map is in EPSG:900913. I have tried > > a number of things, such as adding format: new OpenLayers.Format.GML({xy: > > false}) to the vector layer, but the order of the coordinates does not > > change. I have a control for selecting features from this same WMS layer, > > and when those features are returned, the coordinates are listed longitude > > and then latitude. > > > > Obviously I am missing something. Can someone point me in the right > > direction to find out why the coordinates are reversed? > > > > Any suggestions are greatly appreciated. > > > > Thanks. > > _______________________________________________ > > Users mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/openlayers-users > > _______________________________________________ > Users mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/openlayers-users
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