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222 Z-Family Technical Reference Manual

The parameters description for each map projection type is as follows:

Table 6.154: UDG Structure for Equatorial Mercator

Field Description Range Units

s1 Map projection type EMER n/a

d2 Number of parameters for the selected projection 3 n/a

f3 Longitude for the Central Meridian ±1800000.0000 dddmmss.ssss

f4 False Northing ±10,000,000 meters

f5 False Easting ±10,000,000 meters

Table 6.155: UDG Structure for Transverse Mercator

Field Description Range Units

s1 Map projection type TM83 n/a

d2 Number of parameters for the selected projection 5 n/a

f3 Longitude for Central meridian ±1800000.0000 dddmmss.ssss

f4 Scale factor at Central Meridian 0.5-1.5 n/a

f5 Latitude of the grid origin of the projection ±900000.0000 ddmmss.ssss

f6 False Easting ±10,000,000 meters

f7 False Northing ±10,000,000 meters

Table 6.156: UDG Structure for Oblique Mercator

Field Description Range Units

s1 Map projection type OM83 n/a

d2 Number of parameters for the selected projection 6 n/a

f3 Azimuth of the skew axis ±1800000.0000 ddmmss.ssss

f4 Scale factor at center of projection 0.5-1.5 n/a

f5 Longitude of the grid origin of the projection ±1800000.0000 ddmmss.ssss

f6 Latitude of the grid origin of the projection ±900000.0000 ddmmss.ssss

f7 False Easting ±10,000,000 meters

f8 False Northing ±10,000,000 meters

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