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C 

Commands Summary

MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1

133

This command permits entry of customized ellipsoidal datum parameters. Use this command in conjunction with
the 

DATUM

 command. The default setting is 

WGS84

.

userdatum 6378206.4,294.9786982,-12,147,192,0,0,0,0

USERDATUM  semi-major

flattening

dx

dy

dz

rx

ry

rz

scale

USERDATUM

-

Command

userdatum

semi-major

min.
6300000.0
max.
6400000.0

Datum Semi-major Axis (a) in metres

6378137.000

6378206.4

flattening

min.

290.0

max. 305.0

Reciprocal Flattening, 1/f = a/(a-b)

298.257223563

294.9786982

dx,dy,dz

min.

-  2000.0

max.

2000.0

Datum offsets from WGS84  in meters:
These will be the translation values between your datum 
and WGS84 (internal reference)

0.000,0.000,0.000

-12,147,192

rx,ry,rz

min.

-10

max.

10

Datum Rotation Angle about X, Y and Z axis (sec of arc):
These values will be the rotation between your datum 
and WGS84

0.000,0.000,0.000

0,0,0

scale

min.

-10

max.

10

Scale value is the difference in ppm between your datum 
and WGS84

0.000

0