convert x y to lat long

[RichardDeVita]

I have a map with multiple layers.  I got this from an example.

streetMap =    new esri.layers.ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer", {id:"streetMap"});

  map.addLayer(streetMap);

The layers display and I can switch between layers.  all is fine.

I can draw on the map.  I want to save to points of the polygon.  However the points I get from the geometry object are x y not
latitude and longitude.



dojo.connect(tb, "onDrawEnd", addGraphic);


function addGraphic(geometry) {

  var pts = geometry.rings; 

pts is a array of x and y coords.

How do i get the graphics object to return Latitude and longitude ?  Or how do I convert x y to latitude and logitude ?

Thank you

[TimDine]

You could project the points using a geometry service.

http://developers.arcgis.com/en/javascript/jssamples/util_project.html

[KenBuja · Accepted solution]

You can use esri.geometry.xyToLngLat, which translates Web Mercator coordinates to lat/long.

[RichardDeVita]

Thank You.

esri.geometry.xyToLngLat  is working.

the app is  using esri.layers.ArcGISTiledMapServiceLayer  to add several layers.

streetMap, imagery, topoolgies and some others

In some variations I also set the extent. 

map.setExtent(new esri.geometry.Extent(-144.1358, 7.9814859, -52.76454, 68.8952, new esri.SpatialReference({wkid: 4326})));

Does the wkid  have any effect on xyToLngLat ?  

Also set layers does not have a wkid parameter.  what does it use ?

Again, thank you

[KenBuja]

Don't forget to click the check mark and promote the post that best answered your original question.

The conversion will only work for a geographic coordinate system, and I believe (and someone please correct me if I'm wrong) only with 4326.

[TimDine]

Correct, that function will only do web mercator to WGS84 Decimal Degrees.

Geometry service sample from ESRI would be used to project between other coordinate systems.

[JeffJacobson]

A good alternative to using a Geometry service to do projections is to use proj4js and do the conversions on the client.