sample script to download UMD forest cover loss data (untested) http://www.earthenginepartners.appspot.com/science-2013-global-forest/download.html

hansen.py

import os
import sys

import requests

 
basefname = 'Hansen_GFC2013_lossyear_%d%s_%03d%s.tif'
baseurl = 'http://commondatastorage.googleapis.com/earthenginepartners-hansen/GFC2013/%s'

def download(url, output):

    r = requests.get(url, stream = True)
    if not r.status_code == 404:
        print 'Downloading %s' % url
        print 'Saving to %s' % output
        with open(output, 'wb') as f:
            for chunk in r.iter_content(chunk_size=1024):
                if chunk:
                    f.write(chunk)
        print "Download complete\n\n"
    else:
        print "Skipping %s - does not exist" % os.path.split(output)[1]

def northing(lat):
    if lat >= 0:
        return 'N'
    else:
        return 'S'

def easting(lon):
    if lon >= 0:
        return 'E'
    else:
        return 'W'

def gen_fnames(lat, lon, path):

    # e.g. '/tmp/Hansen_GFC2013_lossyear_50N_010W.tif'
    north = northing(lat)
    east = easting(lon)

    fname = basefname % (abs(lat), north, abs(lon), east)

    url = baseurl % fname

    local_path = os.path.join(path, fname)
    
    return dict(url=url, path=local_path)
    
def get_file(lat, lon, path):

    name_dict = gen_fnames(lat, lon, path)
    download(name_dict['url'], name_dict['path'])

    return

def main(path='/tmp'):
    for lat in range(-90, 90 + 1, 10):
	for lon in range(-180, 180 + 1, 10):
            get_file(lat, lon, path)

if __name__ == '__main__':
    if len(sys.argv) > 1:
        main(sys.argv[1])
    else:
        main()