109
Commands
No = a / (1-e^2 * sin^2 Fo)^1/2: radius of curvature in prime vertical at Fo
Examples:
Set datum to grid transformation parameters for Lambert Conformal CA-zone 4:
$PASHS,UDG,LC83,6,360000.0,371500.0,-1190000.0,352000.0,
2000000,500000
Set datum to grid transformation parameters:
$PASHS,UDG,LC83,637 8240,297.323,121.4,18.9,0,0,0,1.5
$PASHQ,UDG,[c1]
This command allows you to query current UDG parameters, where c1 is the
optional port designator for the output of the response. If a port is not specified, the
receiver sends the response to the current port.
Table 4.53. 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
f4 Longitude of Central meridian T2
f5 Degree, minute portion of the rectifying latitude wo for Fo, latitude of origin T3
f6 Remainder of woT4
f7 Scale along central meridian T5
f8
(1/6 * Rm * Nm * T5
2
) * 10
15
Rm = radius of curvature in meridian plane
Nm = radius of curvature in prime vertical
Both are calculated for the mean latitude of the area in the zone.
T6
Table 4.54. UDG Structure for Transverse Mercator SPC27 Alaska Zones 2-9
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
G12RevD.book Page 109 Tuesday, April 2, 2002 4:33 PM
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