R-Tree spatial index for Python GIS
Project description
Whether for in-memory feature stores, Plone content, or whatever – we need an index to speed up the search for objects that intersect with a spatial bounding box.
See also CHANGES.txt.
Index Protocol
In a nutshell:
>>> from rtree import Rtree >>> index = Rtree() >>> index.add(id=id, bounds=(left, bottom, right, top)) >>> [n for n in index.intersection((left, bottom, right, top))] [id]
This resembles a subset of the set protocol. add indexes a new object by id, intersection returns an iterator over ids where the node containing the id intersects with the specified bounding box. The intersection method is exact, with no false positives and no missed data. Ids can be ints or long ints; index queries return long ints.
Installation
First, download and install version 1.3 of the spatialindex library from:
http://trac.gispython.org/projects/SpatialIndex/wiki/Releases
The library is a GNU-style build, so it is just a matter of:
$ ./configure; make; make install
At this point you can get Rtree 0.4 via easy_install:
$ easy_install Rtree
or by running the local setup.py:
$ python setup.py install
You can build and test in place like:
$ python setup.py test
Previous Versions
Users of Rtree versions <= 0.3 should use spatialindex 1.1.1. Download and install a copy of both spatialindex and tools libraries from:
http://research.att.com/~marioh/tools/index.html
http://research.att.com/~marioh/spatialindex/index.html
Each library is a GNU-style build, so it should just be a matter of:
$ CPPFLAGS=-DNDEBUG ./configure; make; make install
for each. Debugging is on by default in 1.1.1, you’ll want to turn it off for use in production. The spatialindex library depends on the tools library, so make sure to build and install that first.
Usage
See tests/R-Tree.txt.
Performance
See the tests/benchmarks.py file for a comparison.
Support
For current information about this project, see the wiki.
If you have questions, please consider joining our community list:
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