Parameter Name

Description

PARM1

Longitude, in degrees, of the central meridian.

PARM2

Longitude, in degrees, of the eastern meridian. The western me­ridian is assumed to be west of the central meridian by the same amount that the eastern meridian is east of the central meridian.

PARM3

Latitude, in degrees, of the northern standard parallel.

PARM4

Latitude, in degrees, of the southern standard parallel.

MAP_SCL

Used only when defining a coordinate system that is to produce measurements on a scaled paper map. This value is the scale of the map, e.g., 100,000. Normally, this value is set to 1.0.

X_OFF

The false easting to be applied to all X coordinates, usually se­lected to cause all X coordinates within the coordinate system to be positive values of reasonable size.

Y_OFF

The false northing to be applied to all Y coordinates.