It is designed to create databases that are optimized for rendering/tile/map-services.
It is developed and supported by `Omniscale <http://omniscale.com>`_ and is released as open source under the `Apache Software License 2.0 <http://www.apache.org/licenses/LICENSE-2.0.html>`_. Imposm3 is a rewrite of Imposm 2 with even better performance and support for (minutely) diff updates.
Imposm is parallel from the ground up. It distributes parsing and processing to multiple CPUs/cores.
Unify values
For example, the boolean values `1`, `on`, `true` and `yes` all become ``TRUE``.
Filter by tags and values
It only imports data you are going to render/use.
Efficient nodes cache
It is necessary to store all nodes to build ways and relations. Imposm uses a file-based key-value database to cache this data. This reduces the memory usage.
Generalized tables
It can automatically create tables with lower spatial resolutions, perfect for rendering large road networks in low resolutions for example.
Don't know which tags you will be needing? Store all tags in an `HStore column <http://www.postgresql.org/docs/9.3/static/hstore.html>`_.
Support
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There is a `mailing list at Google Groups <http://groups.google.com/group/imposm>`_ for all questions. You can subscribe by sending an email to: imposm+subscribe@googlegroups.com
For commercial support `contact Omniscale <http://omniscale.com/contact>`_.
Development
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The source code is available at: https://github.com/omniscale/imposm3/
You can report any issues at: https://github.com/omniscale/imposm3/issues