Offline reverse geocoder in Python using sqlite3

Overview

rgeocode

Offline reverse geocoder

rgeocode accepts a geographic coordinate pair (latitude and longitude) and returns a list containing the name of:

  • A geographical point
  • First administrative unit
  • Second administrative unit
  • Country

Credits: rgeocode uses data sourced from https://www.geonames.org/ and is used under a CC 4.0 license (link to Creative Commons 4.0)

Install

pip install r-geocode

>>>   from rgeocode import start_rgeocode
 
>>>   location = start_rgeocode(40.689247, -74.044502)
 
>>>   print(location)
    
['Statue of Liberty', 'New York', 'New York County', 'United States']

Requirements

  • sqlite3
  • python version >= 2.5

First run

The first time rgeocode is run, it attempts to download the required files (countryInfo.txt, admin1CodesASCII.txt, admin2Codes.txt) from geonames.org. The three files have a combined size of ~1.6GB. After the download completes, the required data is copied to a local sqlite3 database. After the database is created, the downloaded files are deleted. rgeocode creates - admin1.tsv, admin2.tsv, countries.tsv, and geo.db. The combined size of these files is ~600MB. Subsequent calls to start_rgeocode() reference the data in these files. The files are created in the same folder as the script in which start_rgeocode() is imported. When start_rgeocode() is called from the interactive shell the files are downloaded and created in the home path.

Options

If you need to reverse geocode for locations only in specific countries, you can reduce the size of the database (geo.db) by calling filter_rgeocode(stringList).

 >>>  from rgeocode import filter_rgeocode
 
 >>>  codelist = ['IN', 'US']
 
 >>>  status = filter_rgeocode(codelist)
 
 >>>  print(status)
 
 Database filtered: Deleted 9291519 rows.

To retrieve ISO country codes:

 >>>  from rgeocode import country_code
 
 >>>  codes = country_code()
                                                                                                             
 >>>  print(codes)
 
 {'AD': 'Andorra', 'AE': 'United Arab Emirates', ... , 'ZW': 'Zimbabwe', 'CS': 'Serbia and Montenegro'}

Other projects: Reverse geocoding postal codes

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