[Qgis-user] Difference: EPSG 3004 - EPSG 102092

[Paolo]

Oops... I forgot the most important part in my first post. Here are the 
edfinitions:

EPSG 3004 - Monte Mario / Italy zone 2:
+proj=tmerc +lat_0=0 +lon_0=15 +k=0.9996 +x_0=2520000 +y_0=0 +ellps=intl 
+towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68 +units=m +no_defs

EPSG 102092 - Monte_Mario_Italy_2:
+proj=tmerc +lat_0=0 +lon_0=15 +k=0.9996 +x_0=2520000 +y_0=0 +ellps=intl 
+units=m +no_defs

3004 works well with my data, while 102092 does not.
There appears to be a relatively large shift, in the order of tens or 
hundreds meters,monstly along the north - south direction.

Thanks
Paolo



Il 07/11/2013 00:47, G. Allegri ha scritto:
> In QGIS they appear having the same definition, Could you paste the 
> 102092 definition that you have?
>
> giovanni
>
>
> 2013/11/6 Paolo <e-paul at tiscali.it <mailto:e-paul at tiscali.it>>
>
>     Hello,
>     I am a relatively recent QGIS user. I am at the moment using
>     version 2.0 - Dufour.
>     I would like to ask a simple question about two different datums I
>     am experiencing problems with.
>     They are: EPSG 102092 and EPSG 3004.
>     Accordinf to my (short) research, they  are supposed to be exactly
>     the same datum, but the definitions in QGIS are different.
>     If I use 3004, the specific data set I'm using will overlap
>     properly with the other datasets, but it will not if I use 102092.
>     Can anybody help me getting a better understanding of this behaviour?
>     Thanks
>     Paolo
>     _______________________________________________
>     Qgis-user mailing list
>     Qgis-user at lists.osgeo.org <mailto:Qgis-user at lists.osgeo.org>
>     http://lists.osgeo.org/mailman/listinfo/qgis-user
>
>
>
>
> -- 
> Giovanni Allegri
> http://about.me/giovanniallegri
> blog: http://blog.spaziogis.it
> GEO+ geomatica in Italia http://bit.ly/GEOplus

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20131107/fdaa2efc/attachment.html>