Convert geographic coordinates to UTM zone 29N with Javascript

I have an issue converting lat longs to UTM with the ArcGIS javscript API.

Lets say that I have a map, based on the UTM zone 29N, also known as WKID 32629.

I have a known set of coordinates from a GPS, in this format:

Latitude:  62.220596 
Longitude: -6.564331

The geograpic coordinates are in WKID 4326.

To convert using javascript I have been trying to use the Geometry Service's project method.

If we look at this post in the ArcGIS forum, it is about the same issue. Here, I have tried using the same code, and adjusting the wkid of the output spatialReference to 32629, and you see it returns only NaN, try in the JSfiddle to change the wkid to 4326, and you will see geographic coordinates.

Edit 1

Looking at the HTTP requests made to the server, I see this url is requested (now using the map of the Faroe Islands)

http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer/project?f=json&outSR=32629&inSR=4326&geometries={"geometryType":"esriGeometryPoint","geometries":[{"x":62.01387,"y":-6.7866,"spatialReference":{"wkid":4326}}]}&callback=dojo.io.script.jsonp_dojoIoScript2._jsonpCallback

This looks like a correct url, containing outSR, inSR, geometries, and callback. However, simulating requests to this url gives me either a 500 Internal Server Error, or this string:

dojo.io.script.jsonp_dojoIoScript2._jsonpCallback({"error":{"code":400,"message":"Unable to complete Project operation.","details":["Error projecting geometries"]}});

Any ideas?

Answer

I haven't looked at your code, but in the URL you provided, your X and Y are flipped around. For Faroe Islands, X should be -6.7866 (longitude) while Y should be 62.01387 (latitude). Here's a working URL of what you're trying to do:

http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer/project?f=json&outSR=32629&inSR=4326&geometries={"geometryType":"esriGeometryPoint","geometries":[{"x":-6.7866,"y":62.01387,"spatialReference":{"wkid":4326}}]}&callback=dojo.io.script.jsonp_dojoIoScript2._jsonpCallback

That correctly returns:

dojo.io.script.jsonp_dojoIoScript2._jsonpCallback({"geometryType":"esriGeometryPoint","geometries":[{"x":615863.053581134,"y":6877701.89119242}]});

As for 500s, I seem to get those quite frequently with sampleserver3 as well tonight. Try using sampleserver1 instead, that one seems to be more stable.