# this file contains datum shift parameters for the 
# 7 parameter Bursa-Wolf datum shift transformation,
# it supplies a datum database table for GRASS 5.0
# format:
# shortname "description" ellipsoid dx= dy= dz= Rx= Ry= Rz= M=
#
# where short name is a single word datum specifier,
# description is a long name (enclosed in double qoutes), 
# ellipsoid is the acronym of the ellipsoid used with this map datum, 
# dx, dy, dz, Rx, Ry, Rz (in radians) and M (in ppm) are the 
# datum shift parameters.
# no spaces allowed before or after the =.
#
# Please comment and cite the source if you add new parameters 
# to this list. 
# from NIMA document TR8350.2

# different sources:
# Potsdam Rauenberg, unknown source
#potsdam		"Potsdam Rauenberg" 	  bessel        dx=-597.539 dy=-37.068 dz=-402.808 Rx=-1.37   Ry=0.37    Rz=-2.65  M=-8.92
# Potsdam Rauenberg 1950
potsdam		"Potsdam Rauenberg 1950"  bessel	dx=586.0    dy=87.0    dz=409.0    Rx=-0.52   Ry=-0.15   Rz=2.82   M=9
#potsdam 	"Potsdam Rauenberg 1950"  bessel	dy=582.0    dy=105.0   dz=414.0    Rx=-1.04   Ry=-0.35   Rz=3.08   M=9
# System 42 1983 Pulkow ?
#S-42	"System 42 1983"		  krassovsky	dx=24.0     dy=-123.0  dz=-94.0    Rx=-0.02   Ry=0.25    Rz=0.13   M=1.1
pulko	"Pulkovo 1942"			  krassovsky 	dx=24.0     dy=-123.0  dz=-94.0    Rx=-0.02   Ry=0.25    Rz=0.13   M=1.1
# OSGB36 from document 50000026.pdf from Ordnance Survey at http://www.o-s.co.uk/services/geo6.htm
# these parameters transform from ERTS89 (WGS84) to OSGB36/ODN datum, accuracy about 5 meters. 
# M = Scale, Scale Factor = 1:20.4894 => Scale (1-SF) = 0.9511942 ??? don't know what this is here, so don't use it. 
# OSGB36	"Ordnance Survey GB 1938"	airy	dx=-446.448 dy=125.157 dy=-542.060 Rx=-0.1502 Ry=-0.2470 Rz=-0.8421 M=0.9511942
# from the NIMA geotrans package from the file 7_param.dat (with the us-american sign convention?)
#eur50	"European 1950 mean"	          international	dx=-102.0   dy=-102.0  dz=-129.0   Rx=0.413   Ry=-0.184  Rz=0.385  M=-0.0000024644
#osgb36	"Ordnance GB 1936 mean"		  airy	        dx=446.0    dy=-99.0   dz=544      Rx=-0.945  Ry=-0.261  Rz=-0.435 M=-0.0000208927
# acronym "Descriptive Name" ellipsoid    dx= dy= dz= Rx= Ry= Rz= M=