[Freegis-list] PROJ4 mass convert

[Bernhard Herzog]

"Roderick A. Anderson" <raanders at tincan.org> writes:

> The man page is less than clear on converting 'lots' of coordinates.  In 
> fact it only shows one set at a time.

Well, the man page I've got here has this example:

             proj +proj=utm +lon_0=112w -r <<EOF
             45d15'33.1"   111.5W
             45d15.551666667N   -111d30
             +45.25919444444    111d30'000w
             EOF

which converts three coordinate pairs.

>    Is there a method to convert a whole file full of coordinates
> (LAT/LONG) to another coordinate system (UTM zone 11N)?  Well other than
> using a for;do;done loop and starting PROJ4 up several hundred thousand
> to millions of times.

According to the manpage and the above example you can just use

  proj +proj=utm file

to convert all coordinates in file (you'll have to provide some
additional parameters to specify the UTM zone, of course). 

I have to admit that I haven't used the command line tool much, so maybe
there's a problem I don't see. 

HTH,

   Bernhard

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