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

[Christopher Schmidt]

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/

-- 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

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-- 
Christopher Schmidt
MetaCarta