USERDATUM

Sets user customized ellipsoid and datum transformation

Platform:

OEM719, OEM729, OEM7500, OEM7600, OEM7700, OEM7720, PwrPak7, CPT7, CPT7700, SMART7, SMART2

This command is like the USEREXPDATUM command but without parameter rates. See the USEREXPDATUM command for details on command usage and parameter meaning.

When the USERDATUM command is entered, the USEREXPDATUM command is issued internally with the USERDATUM command values. It is the USEREXPDATUM command that appears in the RXCONFIG log. Only a single set of USEREXPDATUM or USERDATUM entered parameters is valid at one time. Newer parameters entered by either command will overwrite previously entered parameters.

See the DATUM command for important guidance and details on datum operation.

Message ID: 78

Abbreviated ASCII Syntax:

USERDATUM semi_major_axis flattening dx dy dz rx ry rz scale

Factory Default:

USERDATUM 6378137.0 298.2572235628 0.0 0.0 0.0 0.0 0.0 0.0 0.0

ASCII Example:

USERDATUM 6378206.400 294.97869820000 -12.0000 147.0000 192.0000 0.0000 0.0000 0.0000 0.000000000

Field	Field Type	ASCII Value	Binary Value	Description	Format	Binary Bytes	Binary Offset
1	Command header	-	-	USERDATUM header This field contains the command name for abbreviated ASCII or the message header for ASCII (see page 1) or Binary (see page 1).	-	H	0
2	semi_major_axis	6300000.0 - 6400000.0		Datum semi-major axis (a) (metres)	Double	8	H
3	flattening	290.0 - 305.0		Reciprocal Flattening, 1/f = a/(a-b)	Double	8	H+8
4	dx	± 2000.0		Translation values (metres)	Double	8	H+16
5	dy	± 2000.0			Double	8	H+24
6	dz	± 2000.0			Double	8	H+32
7	rx	± 10.0 radians		Datum rotation angles A positive sign is for counter clockwise rotation and a negative sign is for clockwise rotation	Double	8	H+40
8	ry	± 10.0 radians			Double	8	H+48
9	rz	± 10.0 radians			Double	8	H+56
10	scale	± 10.0 ppm		Scale value is the difference in ppm	Double	8	H+64