Created
August 11, 2012 18:53
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geo-assign any arbitrary image to a geotiff usable in tilemill
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import subprocess | |
import sys, re | |
MERC = '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs' | |
infile = sys.argv[1] | |
info_output = subprocess.Popen(['gdalinfo', infile], stdout=subprocess.PIPE).communicate()[0] | |
size_is_re = re.compile('Size is (?P<width>\d+), (?P<height>\d+)') | |
size_is = filter(lambda x: x, map(lambda x: size_is_re.match(x), info_output.split('\n'))) | |
if (len(size_is) != 1): | |
raise 'Could not parse gdalinfo output for image size' | |
size = [float(size_is[0].group('width')), float(size_is[0].group('height'))] | |
aspect_ratio = size[1] / size[0] | |
# the full world dimension | |
dim = 20037508.34 * 2 | |
if (aspect_ratio > 1): | |
h = dim | |
w = dim / aspect_ratio | |
else: | |
h = dim * aspect_ratio | |
w = dim | |
res = subprocess.call(['gdal_translate', '-a_ullr', str(-w/2), str(-h/2), str(w/2), str(h/2), '-a_srs', MERC, infile, '%s.tif' % infile]) | |
if res != 0: | |
raise 'An error occurred upon calling gdal_translate' |
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Hi Tom, i've updated this useful script to make it work with python 3 here https://gist.github.com/brunob/d852eb9711d6dc3325e98db437f4c71c
Feel free to report the small change i've made to your original gist, so that people can find a working script more easily :)