Geospatial Indexing Example — PyMongo 2.5 documentation

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# Geospatial Indexing Example

This example shows how to create and use a `GEO2D` index in PyMongo.

Note

2D indexes require server version >= 1.3.4. Support for 2D indexes also requires PyMongo version >= 1.5.1.

See general MongoDB documentation

geo

## Creating a Geospatial Index

Creating a geospatial index in pymongo is easy:

    >>> from pymongo import MongoClient, GEO2D
    >>> db = MongoClient().geo_example
    >>> db.places.create_index([("loc", GEO2D)])
    u'loc_2d'

## Inserting Places

Locations in MongoDB are represented using either embedded documents or lists where the first two elements are coordinates. Here, we’ll insert a couple of example locations:

    >>> db.places.insert({"loc": [2, 5]})
    ObjectId('...')
    >>> db.places.insert({"loc": [30, 5]})
    ObjectId('...')
    >>> db.places.insert({"loc": [1, 2]})
    ObjectId('...')
    >>> db.places.insert({"loc": [4, 4]})
    ObjectId('...')

## Querying

Using the geospatial index we can find documents near another point:

    >>> for doc in db.places.find({"loc": {"$near": [3, 6]}}).limit(3):
    ...   repr(doc)
    ...
    "{u'loc': [2, 5], u'_id': ObjectId('...')}"
    "{u'loc': [4, 4], u'_id': ObjectId('...')}"
    "{u'loc': [1, 2], u'_id': ObjectId('...')}"

It’s also possible to query for all items within a given rectangle (specified by lower-left and upper-right coordinates):

    >>> for doc in db.places.find({"loc": {"$within": {"$box": [[2, 2], [5, 6]]}}}):
    ...   repr(doc)
    ...
    "{u'loc': [4, 4], u'_id': ObjectId('...')}"
    "{u'loc': [2, 5], u'_id': ObjectId('...')}"

Or circle (specified by center point and radius):

    >>> for doc in db.places.find({"loc": {"$within": {"$center": [[0, 0], 6]}}}):
    ...   repr(doc)
    ...
    "{u'loc': [1, 2], u'_id': ObjectId('...')}"
    "{u'loc': [4, 4], u'_id': ObjectId('...')}"
    "{u'loc': [2, 5], u'_id': ObjectId('...')}"

geoNear queries are also supported using `SON`:

    >>> from bson.son import SON
    >>> db.command(SON([('geoNear', 'places'), ('near', [1, 2])]))
    {u'ok': 1.0, u'near': u'1100000000000001100111100111100000000001100111100111', u'ns': u'geo_example.places', u'stats': ...}

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