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https://github.com/thampiman/reverse-geocoder
A fast, offline reverse geocoder in Python
https://github.com/thampiman/reverse-geocoder
Last synced: about 1 month ago
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A fast, offline reverse geocoder in Python
- Host: GitHub
- URL: https://github.com/thampiman/reverse-geocoder
- Owner: thampiman
- License: lgpl-2.1
- Created: 2015-03-26T10:51:32.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2023-03-19T10:52:18.000Z (over 1 year ago)
- Last Synced: 2024-10-12T19:56:12.787Z (about 1 month ago)
- Language: Python
- Homepage:
- Size: 24.8 MB
- Stars: 1,875
- Watchers: 36
- Forks: 160
- Open Issues: 44
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
Reverse Geocoder
=================
A Python library for offline reverse geocoding. It improves on an existing library called [reverse_geocode](https://pypi.python.org/pypi/reverse_geocode/1.0) developed by [Richard Penman](https://bitbucket.org/richardpenman/reverse_geocode).
*UPDATE (15-Sep-16)*: v1.5.1 released! See release notes below.
### About
Ajay Thampi | [@thampiman](https://twitter.com/thampiman) | [opensignal.com](http://opensignal.com) | [ajaythampi.com](http://ajaythampi.com)
## Features
1. Besides city/town and country code, this library also returns the nearest latitude and longitude and also administrative regions 1 and 2.
2. This library also uses a parallelised implementation of K-D trees which promises an improved performance especially for large inputs.
By default, the K-D tree is populated with cities that have a population > 1000. The source of the data is [GeoNames](http://download.geonames.org/export/dump/). You can also load a custom data source so long as it is a comma-separated file with header (like [rg_cities1000.csv](https://github.com/thampiman/reverse-geocoder/blob/master/reverse_geocoder/rg_cities1000.csv)), containing the following columns:
- `lat`: Latitude
- `lon`: Longitude
- `name`: Name of place
- `admin1`: Admin 1 region
- `admin2`: Admin 2 region
- `cc`: ISO 3166-1 alpha-2 country code
For usage instructions, see below.
## Installation
For first time installation,
```
$ pip install reverse_geocoder
```
Or upgrade an existing installation using,
```
$ pip install --upgrade reverse_geocoder
```
Package can be found on [PyPI](https://pypi.python.org/pypi/reverse_geocoder/).
### Dependencies
1. scipy
2. numpy
### Release Notes
1. v1.0 (27-Mar-15) - First version with support for only Python2
2. v1.1 (28-Mar-15) - Fix for issue [#1](https://github.com/thampiman/reverse-geocoder/issues/1) by [Brandon](https://github.com/bdon)
3. v1.2 (30-Mar-15) - Support for Python 3, conversion of [Geodetic](http://en.wikipedia.org/wiki/Geodetic_datum) coordinates to [ECEF](http://en.wikipedia.org/wiki/ECEF) for use in K-D trees to find nearest neighbour using the Euclidean distance function. This release fixes issues [#2](https://github.com/thampiman/reverse-geocoder/issues/2) and [#8](https://github.com/thampiman/reverse-geocoder/issues/8). Special thanks to [David](https://github.com/DavidJFelix) for his help in partly fixing [#2](https://github.com/thampiman/reverse-geocoder/issues/2).
4. v1.3 (11-Apr-15) - This release fixes issues [#9](https://github.com/thampiman/reverse-geocoder/issues/9), [#10](https://github.com/thampiman/reverse-geocoder/issues/10), [#11](https://github.com/thampiman/reverse-geocoder/issues/11) and [#12](https://github.com/thampiman/reverse-geocoder/issues/12). License has been changed from MIT to LGPL (see [#12](https://github.com/thampiman/reverse-geocoder/issues/12)).
5. v1.4 (08-Jul-16) - Included numpy and scipy as dependencies in setup.
6. v1.5 (15-Sep-16) - Support for custom data source and fixes for issues [#16](https://github.com/thampiman/reverse-geocoder/issues/16) and [#24](https://github.com/thampiman/reverse-geocoder/issues/24). Hat tip to [Jason](https://github.com/swails) and [Gregoire](https://github.com/geekingfrog).
7. v1.5.1 (15-Sep-16) - Fix for [#26](https://github.com/thampiman/reverse-geocoder/issues/26).
## Usage
The library supports two modes:
1. Mode 1: Single-threaded K-D Tree (similar to [reverse_geocode](https://pypi.python.org/pypi/reverse_geocode/1.0))
2. Mode 2: Multi-threaded K-D Tree (default)
```python
import reverse_geocoder as rg
coordinates = (51.5214588,-0.1729636),(9.936033, 76.259952),(37.38605,-122.08385)
results = rg.search(coordinates) # default mode = 2
print results
```
The above code will output the following:
```
[{'name': 'Bayswater',
'cc': 'GB',
'lat': '51.51116',
'lon': '-0.18426',
'admin1': 'England',
'admin2': 'Greater London'},
{'name': 'Cochin',
'cc': 'IN',
'lat': '9.93988',
'lon': '76.26022',
'admin1': 'Kerala',
'admin2': 'Ernakulam'},
{'name': 'Mountain View',
'cc': 'US',
'lat': '37.38605',
'lon': '-122.08385',
'admin1': 'California',
'admin2': 'Santa Clara County'}]
```
If you'd like to use the single-threaded K-D tree, set mode = 1 as follows:
```python
results = rg.search(coordinates,mode=1)
```
To use a custom data source for geocoding, you can load the file in-memory and pass it to the library as follows:
```python
import io
import reverse_geocoder as rg
geo = rg.RGeocoder(mode=2, verbose=True, stream=io.StringIO(open('custom_source.csv', encoding='utf-8').read()))
coordinates = (51.5214588,-0.1729636),(9.936033, 76.259952),(37.38605,-122.08385)
results = geo.query(coordinates)
```
As mentioned above, the custom data source must be comma-separated with a header as [rg_cities1000.csv](https://github.com/thampiman/reverse-geocoder/blob/master/reverse_geocoder/rg_cities1000.csv).
## Performance
The performance of modes 1 and 2 are plotted below for various input sizes.
Mode 2 runs ~2x faster for very large inputs (10M coordinates).
## Acknowledgements
1. Major inspiration is from Richard Penman's [reverse_geocode](https://bitbucket.org/richardpenman/reverse_geocode) library
2. Parallelised implementation of K-D Trees is extended from this [article](http://folk.uio.no/sturlamo/python/multiprocessing-tutorial.pdf) by [Sturla Molden](https://github.com/sturlamolden)
3. Geocoded data is from [GeoNames](http://download.geonames.org/export/dump/)
## License
Copyright (c) 2015 Ajay Thampi and contributors. This code is licensed under the LGPL License.