I'm defining a new GRASS location using the Lambert Conformal Conic projection. My understanding is that the values for the standard parallels and central meridian are dependent on my area of interest; I'm mapping Canada, for which common values are:
- 1st parallel: 49
- 2nd parallel: 77
- Central meridian: -91.86667 (ie, 91 52)
I'm not sure how to determine where to put the central parallel (or if it matters) and what values to use for false easting/northing.
I have found lots of definitions of these parameters online, but no explanation of how to calculate them. Usually this means it would be self-evident if I knew what I was doing!
How do I determine the false easting/northing values for a LCC projection?
After some experimentation, I realize that the false easting/northing values, and the central meridian/parallel, don't change the projection at all; rather, they just shift the location of the origin (i.e., the point considered (0, 0)) for the map. That being the case, is there any convention for setting the origin and/or false easting/northing, or do we just set them to any convenient values for our particular project?