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I am creating a wildlife survey form that has a field where users enter location. Users will be able to enter location using a map (i.e. draggable pushpin) or by manually entering lat/lng. My clients are also requesting an option for entering UTM coordinates.

If a user does enter UTM coords I would like to convert these before pushing to the database. I've seen a couple websites that have utilities for converting UTM to decimal degrees.

Does anyone know of a javaScript lib that will make these conversion given zone and easting-northing? I also saw this thread

Convert geographic coordinates to UTM zone 29N with Javascript

Does ESRI have a web service that I could pass UTM coords to and get lat/lng back?

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2 Answers 2

up vote 3 down vote accepted

If you're not happy with using a Geometry Service like Kirk suggested, you could use proj4js client-side.

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This looks promising. I am converting from UTM Zone 11 EPSG-2153. I don't see this listed under the proj4js lib/defs. Any suggestions? – snowgage May 30 '13 at 20:31
I found the definition on this page and it is the string +proj=utm +zone=11 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_def. You can use the user guide here to figure out how to make that work in your app. – Jason Scheirer May 31 '13 at 6:49
The above definition works great for UTM. thanks – snowgage May 31 '13 at 17:11

You could use the GeometryService on sampleserver6, but there's no guarantee Esri won't change or remove it.

Can call it using javascript Project method.

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interesting but I am looking for a longer term solution – snowgage May 30 '13 at 16:28
@snowgage The geometryservice is part of the default installation for ArcGIS server. If you can find an ArcGIS server site that you can count on, there's a good chance they've published the geometryservice. – Kirk Kuykendall May 30 '13 at 16:35

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