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] - 

	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