Get BBOX value from poly file

poly2bbox.py

import re

def parse(input_file):
    f = open(input_file)
    lines = f.readlines()
    f.close()
    longitudes = []
    latitudes = []
    for line in lines:
        r = re.match("\s+([\w\.\+]+)\s+([\w\.\+]+)", line)
        if r:
            longitudes.append(float(r.groups()[0]))
            latitudes.append(float(r.groups()[1]))
    print "BBOX=" + str(min(longitudes)) + "," + str(min(latitudes)) + "," + str(max(longitudes)) + "," + str(max(latitudes))

if __name__ == '__main__':
    import argparse
    import os
    p = argparse.ArgumentParser(description='Get BBOX value from poly file')
    p.add_argument("input_file", metavar="input_file", help="Input file")
    args = p.parse_args()
    input_file = os.path.abspath(args.input_file)
    parse(input_file)

Hello,

Thanks for this script.
At some point, your regex is wrong to catch these values :

# poly.file from geofabrik
   -2.959590E+00   3.531872E+01
   -2.946335E+00   3.532466E+01

I would change it like that :

import re

def parse(input_file):
  f = open(input_file)
  lines = f.readlines()
  f.close()
  longitudes = []
  latitudes = []
  for line in lines:
    r = re.match("^\s+([\w\.\+\-]+)\s+([\w\.\+\-]+)", line)

    if r:
      
      longitude = r.groups()[0]
      latitude = r.groups()[1]

      print(longitude, float(longitude), latitude, float(latitude))

      longitudes.append(float(longitude))
      latitudes.append(float(latitude))

  bbox = str(min(longitudes)) + "," + str(min(latitudes)) + "," + str(max(longitudes)) + "," + str(max(latitudes))

  print(bbox)

if __name__ == '__main__':
    import argparse
    import os
    p = argparse.ArgumentParser(description='Get BBOX value from poly file')
    p.add_argument("input_file", metavar="input_file", help="Input file")
    args = p.parse_args()
    input_file = os.path.abspath(args.input_file)
    parse(input_file)

Thanks!