[GRASS-dev] r.proj from GaussBoaga to UTM

[Christian Tiso]

Tahnk you Hamish,
running g.setproj in the PERMANENT mapset worked fine.

Thank you all for helping

Christian

Il giorno 27/feb/09, alle ore 03:29, Hamish ha scritto:

>
> Christian Tiso wrote:
>> Thank you markus, you're right, there's no datum
>> definition:
>>
>> GRASS 6.3.0 (fassaGB):~ > g.proj -w
>> PROJCS["Transverse Mercator",
>>    GEOGCS["international",
>>        DATUM["unknown",
>>
>> SPHEROID["International_1924",6378388,297]],
>>        PRIMEM["Greenwich",0],
>>        UNIT["degree",0.0174532925199433]],
> ....
>> but this is beacause I created a new location from the GUI
>> start panel of GRASS by choosing the "EPSG code"
>> button and selectiong the 3003 code which should be the one
>> related to the GaussBoaga, Rome 1940 Monte Mario
>> projections.
>>
>> Where am I wrong? It is not possible to create such a new
>> location only by choosing the EPSG code?
>
> The /usr/share/proj/epsg file's version of 3003 only defines the 1924
> International ellipsoid, not the datum. so that's all grass knows  
> about:
>
> # Monte Mario / Italy zone 1
> <3003> +proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0  
> +ellps=intl +units=m +no_defs  <>
>
>
> try  http://www.epsg-registry.org/  & go to "retrieve by code".
>
> is "Monte Mario" aka "Rome 1940" datum? if so the epsg file may be  
> faulty.
> (don't know; ask on the proj4 mailing list)
>
>
> grass's datum table has rome40:
>
> # Rome 1940 (Sardinia Parameters)
> rome40  "Monte_Mario"                     international dx=-225      
> dy=-65      dz=9
>
> so you could run g.setproj in the PERMANENT mapset, choosing only to
> change the datum and set it that way, or hack the PROJ_INFO file  
> manually.
>
>
> Hamish
>
>
>
>
>

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Christian Tiso, collaborator

Department of Civil and Environmental Engineering
University of  Trento
via Mesiano 77, I-38050 Trento, ITALY
http://www.ing.unitn.it/dica
phone: +39 0461 882610
fax:   +39 0461 882672
E-mail: christian.tiso at ing.unitn.it
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



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