Convert between tms and xyz map tile structures

tms_to_xyz.py

#!/usr/bin/python

# Converts between tms and xyz map tile structures
# October 2014, Matthew Petroff <http://mpetroff.net>

# Released into the public domain using the CC0 Public Domain Dedication
# See <http://creativecommons.org/publicdomain/zero/1.0/>

import os
import subprocess

base_dir = '.'
ext = '.png'

for z in os.listdir(base_dir):
    z_dir = os.path.join(base_dir, z)
    if os.path.isdir(z_dir):
        for x in os.listdir(z_dir):
            x_dir = os.path.join(z_dir, x)
            tmp_x_dir = os.path.join(z_dir, x + '_tmp')
            subprocess.call(['mv', x_dir, tmp_x_dir])
            os.mkdir(x_dir)
            for y in os.listdir(tmp_x_dir):
                old_tile = os.path.join(tmp_x_dir, y)
                new_tile = os.path.join(x_dir, str(2 ** int(z) \
                    - int(y.split('.')[0]) - 1) + ext)
                subprocess.call(['mv', old_tile, new_tile])
            subprocess.call(['rmdir', tmp_x_dir])