[GRASSLIST:8498] Re: EPSG: Basic question...

[Paul Kelly]

On Wed, 5 Oct 2005, Hamish wrote:

>> I usually set my locations on GRASS my hand (step-by-step).
>>
>> But this week I was around with GRASS Newsletter #3 doing the
>> SRTM tutorial. And in one step the tutorial uses EPSG code to
>> set the GRASS location.
>>
>> Well, I don't where I can get this EPSG codes for Brazil or some
>> specific region. Someone can tell how to do this?
>
> http://www.epsg.org/
>
> has the full database, but for the PROJ.4 supplied version that GRASS
> uses hunt for a file called something like  /usr/share/proj/epsg  on

As far as I can remember (I didn't set this up), the version that you can 
list in the GUI startup comes from PROJ, but the version that is actually 
used comes from GDAL and is in one of the .csv files in lib/proj (copied 
to $GISBASE/etc/ogr_csv on install)---pcs.csv I think. So that would be 
the best place to search.

Paul


> your system. Open that in a text editor and search. A quick look turns
> up two codes, 29100 and 29101. Codes for WGS84 lat/lon etc are in the
> article text.
>
> $ grep -A1 Brazil /usr/share/proj/epsg
> # SAD69 / Brazil Polyconic
> <29100> +proj=poly +lat_0=0 +lon_0=-54 +x_0=5000000 +y_0=10000000 +ellps=GRS67 +units=m +no_defs  <>
> # SAD69 / Brazil Polyconic
> <29101> +proj=poly +lat_0=0 +lon_0=-54 +x_0=5000000 +y_0=10000000 +ellps=aust_SA +units=m +no_defs  <>
>
>
>
> Hamish
>
>