[Qgis-developer] proj changed?

Paolo Cavallini cavallini at faunalia.it
Wed Apr 6 07:57:26 EDT 2011


Hi all.
I just noticed that currently EPSG:3003 is defined in QGIS as:

+proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0 +ellps=intl
+towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68 +units=m +no_defs

instead of the old:
+proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0 +ellps=intl
+no_defs

Similarly for EPSG:3004.

The corrections have been already inserted as fake EPSG codes:
40000
+proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0 +ellps=intl
+units=m +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68 +no_defs
40001
+proj=tmerc +lat_0=0 +lon_0=15 +k=0.9996 +x_0=2520000 +y_0=0 +ellps=intl
+units=m +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68 +no_defs
40002
+proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0 +ellps=intl
+units=m +towgs84=-168.6,-34.0,38.6,-0.374,-0.679,-1.379,-9.48 +no_defs
40003
+proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0 +ellps=intl
+units=m +towgs84=-50.2,-50.4,84.8,-0.690,-2.012,0.459,-28.08 +no_defs

So the fake codes 40000 and 40001 are now duplicates, and should be
removed. 40002 and 40002 are useful, as they define ad hoc datum for
Sardinia and Sicily.

Can we correct the internal db? Anyone knows the rationale for this
change?

All the best.
-- 
http://www.faunalia.it/pc



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