Skip to main content

A lightweight Django Geo Field to save and handle Geo Points. It supports to search the nearby points by their geohash

Project description

Django-GeoField
=====
![](https://api.travis-ci.org/joway/django-geofield.svg?branch=master)

A lightweight Django Geo Field to save and handle Geo Points. It supports to search the nearby points by their geohash.

Quick start
-----------

0. Install django-geofield

pip install django-geofield

1. Define GeoPositionField in your Model like this::

class Point(models.Model):
...
position = GeoPositionField(db_index=True)

2. Run `python manage.py makemigrations` and `python manage.py migrate` to make it effect

3. The field will save a geo point with a string into database like this :

Point.objects.create(
position=GeoPosition(lat, lon, precision=6))

'wtmm7w,30.49145747305400533377905958332121372222900390625,120.042387425481223317547119222581386566162109375'

4. If you want to query the points whose geohash is matched exactly with the given point , you can :

pos = Point.objects.get(id=1)

points_matched = Point.objects.filter(position__geoprecise=pos.position.geohash)


The '__geoprecise' lookup will find all points have the same geohash.

5. If you want to query the points in expand area to eliminate the geohash's marginal error, you can :

pos = Point.objects.get(id=1)

points_matched = Point.objects.filter(position__geosearch=pos.position.geohash)

The '__geosearch' lookup will find all points have one of 9 ( 1 center point and 8 expand point) geohash .


6. If you want to query the points within a specific range , you should lookup the geohash table to get the geohash length you want, then just search the cropped length.

pos = Point.objects.get(id=1)

points_matched = Point.objects.filter(position__geosearch=pos.position.geohash[0:4])

![](http://images.cnitblog.com/blog/522490/201309/09185913-9f6f65fc3d3c40ecb3328970831c625c.png)

#### PS:

If you want to limit the distance strictly, you should writer your own codes to filter the result .

About GeoHash
------

[Wikipedia](http://en.wikipedia.org/wiki/Geohash)




Support
------

python:
- "2.7"
- "3.2"
- "3.3"
- "3.4"
- "3.5"
- "3.5-dev" # 3.5 development branch
- "nightly" # currently points to 3.6-dev


Thanks
------

[python-geohash](https://github.com/hkwi/python-geohash/blob/master/geohash.py)

License
------

MIT

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

django_geofield-0.0.2.tar.gz (8.3 kB view hashes)

Uploaded Source

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page