[Proj] conversion latlong to UTM (& vice versa)
Oscar van Vlijmen
ovv at hetnet.nl
Thu Nov 2 18:41:52 EST 2006
> From: oon-informatika.org
> Date: Thu, 02 Nov 2006 16:22:44 +0700
> Subject: [Proj] conversion latlong to UTM (& vice versa)
> If I convert from latlong projection to UTM projection,
> I can get the UTM zone from UTM definition, so I can calculate the zone
> from it's longitude.
> If I'm doing vehicle tracking with UTM projection,
> and the vehicle moving between UTM zones,
> How should I do to get UTM zone of current position of vehicle?
> (so I can convert UTM to latlong again).
> Is it any statement or definition of UTM that declare
> how to get UTM Zone from UTM coordinate?
I believe it is not possible to derive from the UTM coordinates the zone
lat=35, lon=113, zone=49 (central meridian = 111)
gives UTM coordinates (x,y):
Exactly the same UTM coordinates are produced for:
lat=35, lon=119, zone=50 (central meridian = 117)
So, there is only one option: convert back from UTM with known zone number
to lat,lon and reconvert in the other zone to UTM.
Or, set the tracking system to lat,lon production!
More information about the Proj