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. |