It might be something serious... or maybe not (?)
EPSG:2100 is the Greek Geodetic Rereference System 1987 ( I insist it
should be named Hellenic Geodetic... etc). This Projected Coordinate
Reference System is based on the GRS80 [1]
* Whenever I create a LOCATION with this code through GRASS and through
QGIS-GRASS-plugin as well, g.region gives me:
g.region -p
projection: 99 (Transverse Mercator)
zone: 0
datum: towgs84=-199.87,74.79,246.62,0,0,0,0
ellipsoid: wgs84
north: 4435095.69823435
south: 3872235.50561798
west: 134120.591
east: 591637.112
[...]
* On another, manually created LOCATION I used following parameters
(with the GRS80 ellispoid of course):
+proj=tmerc +lat_0=0 +lon_0=24 +k=0.999600 +x_0=500000 +y_0=0
+ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +units=m +no_defs
and g.region -p gives me correctly:
g.region -p
projection: 99 (Transverse Mercator)
zone: 0
datum: towgs84=-199.87,74.79,246.62
ellipsoid: grs80
north: 4256000
south: 3993750
west: 225500
east: 469000
[...]
* The respective "sentence" in /usr/share/proj/epsg is:
<2100> +proj=tmerc +lat_0=0 +lon_0=24 +k=0.999600 +x_0=500000 +y_0=0
+ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +units=m +no_defs <>
---
* How can I find out which epsg "file" is GRASS using when creating a
LOCATION?
[1] http://www.epsg-registry.org/ - Search after code 2100