LMAF: Lambert Conformal Conic Projection (2SP) with Affine Post Process

This projection extends the LM projection (Lambert Conformal Conic – Two Standard Parallels) with an affine post-process. The affine post-process is applied as the last item in the calculation, even after the application of the false origin. The form of the affine transformation is as follows:

newX = A0 + oldX * A1 + oldY * A2

newY = B0 + oldX * B1 + oldY * B2

Parameter Name Description

PARM1

Latitude, in degrees, of the first standard parallel (usually the northernmost).

For this projection, there is no distinction between the northern (PARM1) and southern (PARM2) standard parallels; that is, they can be switched with no effect.

PARM2

Latitude, in degrees, of the second standard parallel (usually the southernmost).

This parameter is sometimes set to the same value as PARM1 to obtain a conic with a single point of tangency, that is, a single standard parallel.

ORG_LNG

The longitude, in degrees, of the origin of the projection.

ORG_LAT

The latitude, in degrees, of the origin of the projection.

PARM3

Coefficient A0

PARM4

Coefficient B0

PARM5

Coefficient A1

PARM6

Coefficient A2

PARM7

Coefficient B1

PARM8

Coefficient B2

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.

QUAD

An integer that indicates the Cartesian quadrant of the coordinate system, 1 thru 4. A negative value indicates that the axes are to be swapped after the coordinates have been placed in the indicated quadrant.