I'm new to projections topics and I've got a question that may be silly, but I hadn't found answer so far. I'm trying to use Miller's cylindrical projection for converting osm lat/lon to x,y values. I don't know how should I choose central meridian. It should be calculated for every transformation I make or I choose it once? What should be value of it?
I use this code to calculate miller's projection:
import sys import math lon = float(sys.argv) lat = float(sys.argv) x = lon # - CENTRAL_MERIDIAN? y = 1.25 * math.log(math.tan(math.radians((math.pi/4.0) + (2.0/5.0*lat))))