Parameter Name

Description

ORG_LNG

The longitude of the central meridian of the projection, in de­grees, where positive indicates east longitude. It is this line of longitude which is straight and true to scale. The longitude is also considered the X origin of the projection. The Y origin is always the equator.

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. This is the X coordinate of the coordinate system origin.

Y_OFF

The false northing to be applied to all Y coordinates. This is the Y coordinate of the coordinate system origin.

PARM1-24

These 24 doubles can be used in groups of three to specify the zones of an interrupted Sinusoidal Projection. Leave all values set to zero for a standard single zone projection based on the or­igin longitude specified in the ORG_LNG element.