108 G12 OEM Board & Sensor Reference Manual
The SPC27 map projections presented in Table 4.52 must be used in conjunction
with the Clark 1866 ellipsoid: (a = 6378206.4 m and 1/f= 294.978698200) and the
following datum (Tx = -8.0, Ty = 160.0, Tz = 176.0, rotation and scale = 0) which
is included in the preset datum list as NAC.
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^2F) * cos^2 F] * sin F
* cos F
f11/f12/f13: Ro = a * (1 - e^2) / (1 - e^2 *sin^2 Fo)^3/2: radius of curvature in
meridian plane at Fo
Table 4.52. 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 (Fo) L5
f8 Sine of latitude of central parallel (Fo) computed from basic equations for
Lambert projection with 2 standard parallel
L6
f9 Degree, minute portion of the rectifying latitude wo for Fo, latitude of origin L7
f10 Remainder of woL8
f11 1/6 * Ro * No * 10^6 L9
f12 tanFo / 24 * (Ro * No)^3/2] * 10^24 L10
f13 [(5 + 3 * tan^2 Fo)/120 * Ro * N0^3] * 10^32 L11
Number of parameters for the selected projection 11
G12RevD.book Page 108 Tuesday, April 2, 2002 4:33 PM
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