Transverse Mercator (South Oriented)
| Name
| Transverse Mercator (South Oriented)
|
| EPSG Code
| 9808
|
| GeoTIFF Code
| CT_TransvMercator_SouthOriented (27)
|
| OGC WKT Name
| Transverse_Mercator_South_Orientated
|
| Supported By
| EPSG, GeoTIFF, OGC WKT
|
Projection Parameters
| Name
| EPSG #
| GeoTIFF ID
| OGC WKT
| Units
| Notes
|
| Latitude of natural origin
| 1
| NatOriginLat
| latitude_of_origin
| Angular
|
|
| Longitude of natural origin
| 2
| NatOriginLong
| central_meridian
| Angular
|
|
| Scale factor at natural origin
| 5
| ScaleAtNatOrigin
| scale_factor
| Unitless
|
|
| False Easting
| 6
| FalseEasting
| false_easting
| Linear
|
|
| False Northing
| 7
| FalseNorthing
| false_northing
| Linear
|
|
EPSG Notes
For the mapping of southern Africa a south oriented Transverse Mercator projection is
used. Here the coordinate axes are called Westings and Southings and increment to the
West and South from the origin respectively. The Transverse Mercator formulas need to
be modified to cope with this arrangement with
Westing, W = k0 *[A + (1 - T + C)A3/6 + (5 - 18T + T2 + 72C - 58e'2)A5/120] -
FE
Southing, S = k0{M - M0 + *tan*[A2/2 + (5 - T + 9C + 4C2)A4/24 +
(61 - 58T + T2 + 600C - 330e'2)A6/720]}- FN
In these formulas the terms FE and FN have been retained for consistency of the
terminology. For the reverse formulas, those for the standard Transverse
Mercator above apply, with the exception that:
M1 = M0 + (S + FN)/k0
and D = (W + FE)/(*1k0), with *1 = * for *1