Specifications

Command/Response Formats 225
Commands
f9 :
ω
=
Φ
- [1052.893882 - (4.483344 - 0.002352 * cos^2
Φ
) * cos^2
Φ
] *
sin
Φ
* cos
Φ
f11/f12/f13 : Ro = a * (1 - e^2) / (1 - e^2 *sin^2
Φ
o)^3/2 : radius of
curvature in meridian plane at
Φ
o
No = a / (1-e^2 * sin^2
Φ
o)^1/2 : radius of curvature in prime vertical at
Φ
o
Rm = radius of curvature in meridian plane
Nm = radius of curvature in prime vertical
Both calculated for the mean latitude of the area in the zone.
Example: Set datum to grid transformation parameters for Lambert Conformal CA-
zone 4
$PASHS,UDG,LC83,6,360000.0,371500.0,
Table 6.160: UDG Structure for Transverse Mercator for SPC27
Description
Range/Name in
Table
Map projection type TM27
Number of parameters for the selected projection 6
False Easting or x coordinate of central meridian T1
Longitude of Central meridian T2
Degree, minute portion of the rectifying latitude
ω
o for
Φ
o, latitude of origin
T3
Remainder of
ω
oT4
Scale along the central meridian T5
(1/6 * Rm * Nm * T5^2) * 10^15 T6
Table 6.161: UDG Structure for Transverse Mercator for SPC27 for Alaska
zone 2 through 9
Parameters Description Range/ Name
s1 Map projection type. TMA7
d2 Number of parameters for the selected projection 2
f3 False Easting or x coordinate of central meridian C
f4 Longitude of Central meridian CM