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Merge multiple GeoJSON files into one
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from json import load, JSONEncoder | |
from optparse import OptionParser | |
from re import compile | |
float_pat = compile(r'^-?\d+\.\d+(e-?\d+)?$') | |
charfloat_pat = compile(r'^[\[,\,]-?\d+\.\d+(e-?\d+)?$') | |
parser = OptionParser(usage="""%prog [options] | |
Group multiple GeoJSON files into one output file. | |
Example: | |
python %prog -p 2 input-1.json input-2.json output.json""") | |
defaults = dict(precision=6) | |
parser.set_defaults(**defaults) | |
parser.add_option('-p', '--precision', dest='precision', | |
type='int', help='Digits of precision, default %(precision)d.' % defaults) | |
if __name__ == '__main__': | |
options, args = parser.parse_args() | |
infiles, outfile = args[:-1], args[-1] | |
outjson = dict(type='FeatureCollection', features=[]) | |
for infile in infiles: | |
injson = load(open(infile)) | |
if injson.get('type', None) != 'FeatureCollection': | |
raise Exception('Sorry, "%s" does not look like GeoJSON' % infile) | |
if type(injson.get('features', None)) != list: | |
raise Exception('Sorry, "%s" does not look like GeoJSON' % infile) | |
outjson['features'] += injson['features'] | |
encoder = JSONEncoder(separators=(',', ':')) | |
encoded = encoder.iterencode(outjson) | |
format = '%.' + str(options.precision) + 'f' | |
output = open(outfile, 'w') | |
for token in encoded: | |
if charfloat_pat.match(token): | |
# in python 2.7, we see a character followed by a float literal | |
output.write(token[0] + format % float(token[1:])) | |
elif float_pat.match(token): | |
# in python 2.6, we see a simple float literal | |
output.write(format % float(token)) | |
else: | |
output.write(token) |
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