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Merge two or more geojson files.
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| #!/usr/bin/env python | |
| from json import load, JSONEncoder | |
| from argparse import ArgumentParser, FileType | |
| from re import compile | |
| import sys | |
| float_pat = compile(r'^-?\d+\.\d+(e-?\d+)?$') | |
| charfloat_pat = compile(r'^[\[,\,]-?\d+\.\d+(e-?\d+)?$') | |
| parser = ArgumentParser(description="Group (merge) multiple GeoJSON files.") | |
| defaults = dict(precision=6, outfile=sys.stdout) | |
| parser.set_defaults(**defaults) | |
| parser.add_argument('files', | |
| type=FileType('r'), help='Files to be merged', nargs="+") | |
| parser.add_argument('-p', '--precision', dest='precision', | |
| type=int, help='Digits of precision') | |
| parser.add_argument('-o', '--outfile', dest='outfile', | |
| type=FileType('wb', 0), help='Outfile') | |
| if __name__ == '__main__': | |
| args = parser.parse_args() | |
| infiles = args.files | |
| outfile = args.outfile | |
| outjson = dict(type='FeatureCollection', features=[]) | |
| for infile in infiles: | |
| injson = load(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) | |
| try: | |
| outjson['features'] += injson['features'] | |
| except: | |
| outjson['features'] += injson | |
| encoder = JSONEncoder(separators=(',', ':')) | |
| encoded = encoder.iterencode(outjson) | |
| format = '%.' + str(args.precision) + 'f' | |
| output = outfile | |
| 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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how to use this?