Test scale to zoom conversion

test_scale_zoom.py

# -*- coding: utf-8 -*-
import math

dpi = 1000 / 39.37 / 0.28
ipm = 39.37

metersPerTile = 156543.04

def getZoomFromScale(scale):
  return math.log(scale) / math.log(2)

def getResolutionForScale(scale, mpu = 1.0):
    return scale / (mpu * ipm * dpi)

for scale_mult in range(6):
    scale = 1000 * math.pow(10, scale_mult)
    res = getResolutionForScale(scale)
    zoom = getZoomFromScale(metersPerTile / res)
    print('{} [{}] - {}'.format(scale, res, zoom))