# `index` - Data Stores

The `index` submodule provides efficient storage containers for preprocessed OSM data.

## Node Location Storage

Node location can be cached in a `LocationTable`. There are different implementations available which should be choosen according to the size of data and whether or not the cache should be permanent. See the Osmium manual for a detailed explaination. The compiled in types can be listed with the `map_types` function, new storages can be created with `create_map`.