ashtech DG14, Reference Manual

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176 DG14 and DG16 Board & Sensor Reference Manual
Values are derived from tables which can be obtained from various sources,
including NGS Publication 62-4 (1986 Reprint) which also includes discussion and
definitions of applied formulas and parameters.
f9:
w
=
F
- [1052.893882 - (4.483344 - 0.002352 * cos
2
F
) * cos
2
F
] * sin
F
*
cos
F
f11/f12/f13: Ro = a * (1 - e
2
) / (1 - e
2
*sin
2
F
o)
3/2
: radius of curvature in
meridian plane at
F
o
No = a / (1-e
2
* sin
2
F
o)
1/2
: radius of curvature in prime vertical at
F
o
Table 6.73. UDG Structure for Lambert Conformal Conic for SPC27
Field Description Range / Name
s1 Map projection type. LC27
d2 Number of parameters for the selected projection 11
f3 False Easting or x coordinate of central meridian L1
f4 Longitude of Central meridian L2
f5 Map radius of central parallel ( Fo) L3
f6 Map radius of lowest parallel of the projection table plus y
value on central meridian at this parallel (y = 0 in most cases) L4
f7 Scale (m) of the projection along the central parallel (
F
o
)
L5
f8 Sine of latitude of central parallel (
F
o
)
computed from basic
equations for Lambert projection with 2 standard parallel
L6
f9 Degree, minute portion of the rectifying latitude
w
o for
F
o,
latitude of origin
L7
f10 Remainder of w o L8
f11 1/6 * Ro * No * 10^6 L9
f12 tan F o / 24 * (Ro * No)^3/2] * 10^24 L10
f13 [(5 + 3 * tan^2 F o)/120 * Ro * N0^3] * 10^32 L11
Number of parameters for the selected projection 11
Table 6.74. UDG Structure for Transverse Mercator for SPC27
Field Description Range / Name
s1 Map projection type. TM27
d2 Number of parameters for the selected
projection 6
f3 False Easting or x coordinate of central meridian T1