[OpenLayers-Users] Using Vector features with Google Base Maps..

[Christopher Schmidt]

On Wed, Feb 10, 2010 at 03:44:00PM -0500, Christopher Schmidt wrote:
> On Wed, Feb 10, 2010 at 12:11:46PM -0800, David Van Gilst wrote:
> > Hello, I'm relatively new to OpenLayers and having a problem with a
> > relatively basic setup...
> > 
> > I'm using the Google Base Maps and trying to add a point feature to the map
> > at point -70.84480 and -53.00471. (The airport in Punta Arenas, Chile). When
> > I add the point, the blue star appears at the correct longitude, but at an
> > incorrect latitude.  Furthermore, the point moves when I drag the map up or
> > down, jumping to a different latitude when the mouse button is released.
> > Additionally, when the map is dragged far enough to the right/east, the
> > point disappears.
> 
> http://faq.openlayers.org/vector-related-questions/why-dont-my-vector-features-work-over-google-yahoo-virtual-earth-etc/

Strike that, replace with:

  http://trac.openlayers.org/wiki/FrequentlyAskedQuestions#WhydontmyvectorfeaturesworkoverGoogleYahooVirtualEarthetc.

-- Chris

> -- Chris
> 
> > I've tried using point.transform of the point geometry and changing the
> > projection on the vector layer, and been unable to fix this behavior.  I'm
> > sure I'm missing something relatively simple, but I'm new to this and after
> > two days of digging around the documentation and examples, I'm not sure what
> > it is.  Any suggestions would be appreciated.
> > 
> > The code can be found at: http://128.177.27.207/display.html
> > 
> > or:
> > 
> >                 var layer_style = OpenLayers.Util.extend({},
> >                 OpenLayers.Feature.Vector.style['default']);
> >                 layer_style.fillOpacity = 0.2;
> >                 layer_style.graphicOpacity = 1;
> > 
> >                 var style_blue = OpenLayers.Util.extend({}, layer_style);
> >                 style_blue.strokeColor = "blue";
> >                 style_blue.fillColor = "blue";
> >                 style_blue.graphicName = "star";
> >                 style_blue.pointRadius = 10;
> >                 style_blue.strokeWidth = 3;
> >                 style_blue.rotation = 45;
> >                 style_blue.strokeLinecap = "butt";
> > 
> >                 var options = {
> >                     projection: new OpenLayers.Projection("EPSG:900913"),
> >                     units: "m",
> >                     numZoomLevels: 18,
> >                     maxResolution: 'auto',
> >                     maxExtent: new OpenLayers.Bounds(-20037508, -20037508,
> >                                              20037508, 20037508.34),
> >                     sphericalMercator: true
> >                 };
> > 
> >                 var map = new OpenLayers.Map('map', options);
> > 
> >                 var google_physical =
> >                     new OpenLayers.Layer.Google("Google Physical",
> >                         {type: G_PHYSICAL_MAP});
> >                 var google_sattelite =
> >                     new OpenLayers.Layer.Google("Google Satellite",
> >                         {type: G_SATELLITE_MAP});
> >                 var google_hybrid =
> >                     new OpenLayers.Layer.Google("Google Hybrid",
> >                         {type: G_HYBRID_MAP});
> > 
> >                 map.addLayers([google_sattelite,
> >                                google_physical, google_hybrid]);
> > 
> >                 map.addControl(new OpenLayers.Control.LayerSwitcher());
> >                 map.addControl(new OpenLayers.Control.MousePosition());
> >                 map.addControl(new OpenLayers.Control.KeyboardDefaults());
> > 
> >                 map.setCenter(new OpenLayers.LonLat(-13200000, 4500000), 5);
> >                 map.zoomToMaxExtent();
> > 
> >                 var vectorLayer =
> >                     new OpenLayers.Layer.Vector("Aircraft Location");
> > 
> >                 var point = new OpenLayers.Geometry.Point(-70.84480, -53.00471);
> > 
> >                 var feature = new OpenLayers.Feature.Vector(
> >                     point,
> >                     null,
> >                     style_blue);
> > 
> >                 vectorLayer.addFeatures(feature);
> >                 map.addLayer(vectorLayer);
> > 
> > 
> > 
> > 
> > David Van Gilst
> > DC-8 Network Engineer
> > National Suborbital Education and Research Center
> > University of North Dakota
> > (701) 330-2978
> > d.vangilst at nserc.und.edu
> 
> > _______________________________________________
> > Users mailing list
> > Users at openlayers.org
> > http://openlayers.org/mailman/listinfo/users
> 
> 
> -- 
> Christopher Schmidt
> MetaCarta
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-- 
Christopher Schmidt
MetaCarta