Reprojecting ATOM feeds in SilverLight

adamestrada — Thu, 03 Feb 2011 21:49:41 GMT

All,

As you can see below I have a method that extracts the location information from an ATOM feed. In this case it's all my FourSquare check ins. Anyway, would anyone mind lending a hand on this one? The error I get is that the Point does not fall within a valid range of the geographic coordinate system. I though I was reprojecting it (and the same method worked with my GeoRSS feed) but I still get the error.

   private static ESRI.ArcGIS.Client.Projection.WebMercator _mercator =
            new ESRI.ArcGIS.Client.Projection.WebMercator();

#region Parse ATOM feed (Not Done Yet!)
        private void ATOM(Stream s)
        {
                GraphicsLayer graphicsLayer = Map.Layers["GeoRSSFeed"] as GraphicsLayer;
                graphicsLayer.ClearGraphics();

                var document = XDocument.Load(s);
                if (document.Root == null)
                    return;

                var georss = XNamespace.Get("http://www.georss.org/georss");

                var posts = from ev in document.Descendants("channel").Elements("item")

                              let values = ev.Element(georss + "point").Value.Split(' ')
                              select new 
                              {
                                  Latitude = double.Parse(values[0], System.Globalization.CultureInfo.InvariantCulture),
                                  Longitude = double.Parse(values[1], System.Globalization.CultureInfo.InvariantCulture),
                                  Title = (ev.Element("title").Value),
                              }; 
                foreach (var ev in posts)
                {
                    Graphic graphic = new Graphic()
                        {
                            Geometry = _mercator.FromGeographic(new MapPoint(ev.Latitude, ev.Longitude)),
                            Symbol = LayoutRoot.Resources["QuakePictureSymbol"] as ESRI.ArcGIS.Client.Symbols.Symbol,
                       
                            //MapPoint point = new MapPoint(ev.Latitude, ev.Longitude,
                            //    new SpatialReference(4326));
                            //graphic.Geometry = ESRI.ArcGIS.Client.Bing.Transform.GeographicToWebMercator(point);

                        };
                    graphicsLayer.Graphics.Add(graphic);
                }   
        }
        #endregion

I know that 4326 is the EPSG code for for WGS84 but I've not had to mess with that in the past hence the reason its commented out.

Thanks in advance,
Adam

Re: Reprojecting ATOM feeds in SilverLight

dotMorten_esri — Thu, 03 Feb 2011 22:38:54 GMT

Looks to me like you are switching lat and long:
MapPoint point = new MapPoint(ev.Longitude, ev.Latitude) { SpatialReference = new SpatialReference(4326)) };

Re: Reprojecting ATOM feeds in SilverLight

adamestrada — Thu, 03 Feb 2011 23:16:47 GMT

Morten,

<facepalm>Stupid mistake</facepalm>

Adam

Re: Reprojecting ATOM feeds in SilverLight

dotMorten_esri — Fri, 04 Feb 2011 02:04:27 GMT

I doubt anyone can claim that they have never done this 🙂

Re: Reprojecting ATOM feeds in SilverLight

adamestrada — Fri, 04 Feb 2011 02:14:14 GMT

You Europeans say Long/Lat whereas us Americans say Lat/Long. I am reluctant to say that you're correct in how it should be referred to. BTW, your latest XBox rambings are the dogs bollocks! Did I say that correctly?

Adam

topic Re: Reprojecting ATOM feeds in SilverLight in ArcGIS API for Silverlight Questions

Reprojecting ATOM feeds in SilverLight

Re: Reprojecting ATOM feeds in SilverLight

Re: Reprojecting ATOM feeds in SilverLight

Re: Reprojecting ATOM feeds in SilverLight

Re: Reprojecting ATOM feeds in SilverLight