[Proj] cs2cs - specifying UTM zone on command line

Even Rouault even.rouault at spatialys.com
Mon Oct 29 16:58:30 EST 2018

On lundi 29 octobre 2018 21:11:58 CET Kristian Evers wrote:
> Thanks for putting me straight, everyone. I guess there’s a case for such a
> projection afterall!
> How would this best be described in PROJ?
>  +proj=zutm ? +proj=utm +zone=auto, as Robb suggested? Something else?

One possibility for complete generality could be to align on how it is 
described by EPSG:

(or more readable in " Transverse Mercator Zoned Grid System" in 
guidance 7.2)

And a more understandable example:

So that could be 
+proj=tmerc +lon_0=-180 +lat_0=0 +w=6 +k_0=0.9996 +x_0=500000 +y=0

The presence of the parameter w= could be the one that triggers the automated 
zone mechanism.

But yes as the only practical use is UTM, "+proj=utm +zone=auto [+south]" 
could be used as a shortcut.

Spatialys - Geospatial professional services

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