Fwd: [mapserver-users] Reporting lat/long from projected map units

[Milo van der Linden]

---------- Forwarded message ----------
From: Milo van der Linden <milo at dogodigi.net>
Date: 2011/1/12
Subject: Re: [mapserver-users] Reporting lat/long from projected map units
To: "Bistrais, Bob" <Bob.Bistrais at maine.gov>


Are you talking bout a web-app? Do you use a client like OpenLayers? What
programming language(s) do you use? Is your datasource a database? Like
postgis?

If you can get UTM coordinates from the mouseclick, the next best option (in
my opinion) would be to use proj4js:

http://proj4js.org/

Simply embed the js-library ad an event for mouse handling and convert:
screen->utm->4326.




2011/1/12 Bistrais, Bob <Bob.Bistrais at maine.gov>

>  This should be fairly straightforward, but I was wondering what is the
> easiest and quickest way to convert coordinates on the fly.  All my data is
> in UTM coordinates.  I want to report coordinates to the screen in
> Lat/Long.  Changing the projections on the map files to lat/long (*
> EPSG:4326)* is not an option, as this will cause problems elsewhere.  So
> what I want to do is take point coordinates, either from a mouse click or
> from UTM coordinates, project to lat/long, which will be reported in a
> result window.  What is the quickest way to do this?
>
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>
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