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.. -*- rst -*-
.. highlightlang:: none
Geolocation search
==================
Groonga supports geolocation search. It uses index for
search. It means that you can search by geolocation fast
like fulltext search.
Supported features
------------------
Groonga supports only point as data type. Line, surface and
so on aren't supported yet. Here is a feature list:
#. Groonga can store a point to a column.
#. Groonga can search records that have a point in the specified rectangle.
#. Groonga can search records that have a point in the specified circle.
#. Groonga can calculate distance between two points.
#. Groonga can sort records by distance from the specified
point in ascending order.
Here are use cases for Groonga's geolocation search:
* You list McDonald's around a station.
* You list KFC around the current location sort by distance
from the current location in ascending order with distance.
Here are not use cases:
* You search McDonald's in a city. (Groonga doesn't support
geolocation search by a shape except a rectangle and a
circle.)
* You store a region instead of a point as a lake
record. (A column can't has geolocation data except a
point.)
The following figures show about Groonga's geolocation
search features.
Here is a figure that only has records. A black point
describes a record. The following figures shows how records
are treated.
.. image:: /images/geo-points.png
:alt: only records
Coming soon...
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