i want to display the global gravity data which is in the form of Kml. the link to the file is given below:
ftp://topex.ucsd.edu/pub/global_grav_1min/global_grav.kmz
I wrote a small code using ARcGIS API for WPF and tried to initialize this kml file but I received this exception on running the code:
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07/31/2014 13:37:39 | Fatal | App | Object reference not set to an instance of an object.
STACKTRACE: at ESRI.ArcGIS.Client.Toolkit.DataSources.KmlLayer.Refresh()
at ESRI.ArcGIS.Client.Toolkit.DataSources.KmlLayer.Initialize()
at ESRI.ArcGIS.Client.GroupLayerBase.Initialize()
at ESRI.ArcGIS.Client.Toolkit.DataSources.KmlLayer.backgroundWorker_RunWorkerCompleted(Object sender, RunWorkerCompletedEventArgs e)
at System.ComponentModel.BackgroundWorker.OnRunWorkerCompleted(RunWorkerCompletedEventArgs e)
at System.ComponentModel.BackgroundWorker.AsyncOperationCompleted(Object arg)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) | Object reference not set to an instance of an object. | | Dispatcher.CatchExceptionStatic => Dispatcher.CatchException => App.App_DispatcherUnhandledException
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As we can see that the exception is thrown by ArcGIS API internal functions. My code is given below:
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var kmlLayer = new KmlLayer
{
Url = new Uri(@D:\global_grav.kml, UriKind.Absolute),
ID = "Kml_Samples",
VisibleLayers = new[] { "*" },
}; // I downloaded the file and converted it to kml
kmlLayer.Initialize(); // this is where the exception is thrown.
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Any ideas about what might be causing this behavior? Any help would be highly appreciated. Thanks
