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Field
f5
f6
f7
f8
For these parameters to be used, the DTM parameter must be set to 'USR'.
Example: Define local datum as the WGS-72 datum
This implements the transformations listed in Table 6.32 and below.
x
y
z
WGS 84
Command/Response Formats
Table 6.31: UDD Structure (continued)
Description
Rotation in x axis
+ rotation is counter clockwise,
and rotation is clockwise rotation.
Rotation in y axis
Rotation in Z axis
Scale factor. Range -10.00 to
+10.00
$PASHS,UDD, 0,6378135.0, 298.26,0,0,4.5,0,0,-0.554,0.23
$PASHS,DTM,USR
Table 6.32: Ellipsoid Parameters for WGS-72 and WGS-84
Datum
Reference Ellipsoid
WGS-72
WGS-72
WGS-84
WGS-84
∆x=∆y=0
∆z= 4.5 meters
ε
ε
=ε
=0
= –2.686 x 10
x
y
z
in the following equation:
0
(
=
+
1
+
0.23
0
4.5
–
Range
±10
a[m]
6378135.0
6378137.0
m= 0.23 x 10
-6
radians = –0. 554
1
–
2.686
6 –
×10
)
6 –
×
2.686 10
0
Units
Default
radians
0.0
radians
0.0
radians
0.0
n/a
0.0
1/f
298.26
298.257223563
-6
6 –
×
10
0
x
y
1
0
z
0
1
WGS 72
–
111
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