topic Re: Convert coordinates in ArcGIS JavaScript Maps SDK Questions

Convert coordinates

RossPearson — Wed, 14 Dec 2011 19:05:06 GMT

Hi there,
i'm kinda new to this and i'm trying to get the "Current Location with temporal renderer" sample for mobiles to work with a custom map. The map i'm using has a different spatial reference. So when the position is displayed, it is way off.

As far as i can tell, the coordinates in the sample are converted from WGS84 (format in the Geolocation API) to Web Mercator. Is there any way to convert them to the spatial reference my map is using?

Here's the sample i used (i just changed the map URL in the code):

http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples_start.htm#jssamples/mobile_geolocaterenderer.html

Re: Convert coordinates

derekswingley1 — Wed, 14 Dec 2011 19:12:47 GMT

What's your map's spatial reference? Your best bet is probably to use a geometry service's project method to convert from lat/long to your spatial reference.

Re: Convert coordinates

RossPearson — Wed, 14 Dec 2011 22:35:53 GMT

Ok, thanks.

Is there a sample of it being used anywhere?

The spatial reference is WKID: 3006.

Appreciate the help!

Re: Convert coordinates

derekswingley1 — Sat, 11 Dec 2021 22:28:47 GMT

We have a sample showing how to use the geometry service to project a point: http://help.arcgis.com/en/webapi/javascript/arcgis/help/jssamples/util_project.html

For your case, you'll want to specify a different out spatial reference:

function projectPoint() {
  var outSR = new esri.SpatialReference({ wkid: 3006});
  gsvc.project([ pt ], outSR, function(projectedPoints) {
    pt = projectedPoints[0];
    // do something with coordinates
  });
}

Re: Convert coordinates

RossPearson — Wed, 14 Dec 2011 23:35:13 GMT

Great, tanks alot!

Re: Convert coordinates

RossPearson — Sat, 11 Dec 2021 22:28:50 GMT

Does this make sense?

function zoomToLocation(location) {
        pt = new esri.geometry.Point(location.coords.longitude, location.coords.latitude);
        

 var outSR = new esri.SpatialReference({ wkid: 3006});
 gsvc.project([ pt ], outSR, function(projectedPoints) {
 pt = projectedPoints[0];

     map.centerAndZoom(pt, 8);
   });
      }

Re: Convert coordinates

derekswingley1 — Thu, 15 Dec 2011 19:31:32 GMT

Yes, that looks like it should work.