Imposm

Imposm is an importer for OpenStreetMap data. It reads PBF files and imports the data into PostgreSQL/PostGIS databases. It is designed to create databases that are optimized for rendering/tile/map-services.

It is developed and supported by Omniscale and is released as open source under the Apache Software License 2.0. Imposm >=3 is a rewrite of Imposm 2 with even better performance and support for (minutely) diff updates.

Features

Custom database schemas

It creates separate tables for different feature types. This allows easier styling and better performance for rendering in tile or WMS services.

Multiple CPU/core support

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.

Limit to polygons

It can limit imported geometries to polygons from GeoJSON.

hstore support

Don’t know which tags you will be needing? Store all tags in an hstore column.

Support

There is a mailing list at Google Groups for all questions. You can subscribe by sending an email to: imposm+subscribe@googlegroups.com

Development

The source code is available at: https://github.com/omniscale/imposm3/

You can report any issues at: https://github.com/omniscale/imposm3/issues

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