Reprojecting a Point

AaronNash — Fri, 21 Oct 2011 13:00:11 GMT

I have been struggling with this code for a few days now and have not come to a resolution. What I am trying to do is reproject a geolocation event to display on a base map in a state plane projection. I would prefer to do the calculation on the client side but since I do not know the formula to go from WGS84 to CT State plane NAD83, I am stuck sending the request to my geometry service. I have tried almost everything I can think of (thats why I am posting), in debugging mode I can see the values (Lat and Long) being passed to the geometry service with the output spatial reference, but there are no values being returned. I have tried the ESRI geometry service and my own (which is server 9.3.1), but return no results.

   private function onTravel(event:GeolocationEvent):void 
   { 
     var long:String = event.longitude.toString();
     var lat:String = event.latitude.toString();
     var longnew:Number = Number(long);
     var latnew:Number = Number(lat);
     var GPSPoint:MapPoint = new MapPoint(longnew, latnew);
     geoLat.text = event.latitude.toString();
     geoLong.text = event.longitude.toString(); 
     var graphic:Graphic = new Graphic(GPSPoint, GPSicon);      
     myGraphicsLayer.clear(); 
     myGraphicsLayer.add(graphic);
     var outSR:SpatialReference = new SpatialReference(2234);    
     geometryService.project([GPSPoint as Geometry], outSR); 

   }

   private function projectCompleteHandler(event:GeometryServiceEvent):void
   { 
    try
    {
  
   
    var pt:MapPoint = (event.result as Array)[0]as MapPoint;
    reprojectLat.text = pt.x.toString();
    reprojectLong.text = pt.y.toString();
    }
    catch (error:Error)
    {
     Alert.show(error.toString());
    }
   }

Here is the code I am using, instead of reprojecting the data to display on the map. I created a box on the map that would show the current X and Y and the reprojected X and Y, the map service I am using is in WGS 1984 and the GPS mappoint is displayed correctly on the map. I just cannot figure out why the geometry service is not returning any values...HELP

thanks,
Aaron

Re: Reprojecting a Point

RobertScheitlin__GISP — Fri, 21 Oct 2011 13:31:56 GMT

Aaron,

You need to specify the Spatial Reference of the GPSPoint before you send it to the geometry service for projection (i.e. 4326 if it is WGS 1984).

Re: Reprojecting a Point

AaronNash — Fri, 21 Oct 2011 13:48:29 GMT

that was it, like always thanks so so much for your help. I am now finally returning values

topic Re: Reprojecting a Point in ArcGIS API for Flex Questions

Reprojecting a Point

Re: Reprojecting a Point

Re: Reprojecting a Point