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Fix flake8 issues and add more detail on spatial types

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Chris Amico 2022-02-15 12:08:29 -05:00
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@ -1988,14 +1988,27 @@ Since `SpatiaLite <https://www.gaia-gis.it/fossil/libspatialite/index>`__ is com
SpatiaLite helpers
==================
`SpatiaLite <https://www.gaia-gis.it/fossil/libspatialite/home>`_ adds geographic capability to SQLite (similar to how PostGIS builds on PostgreSQL).
`SpatiaLite <https://www.gaia-gis.it/fossil/libspatialite/home>`_ adds geographic capability to SQLite (similar to how PostGIS builds on PostgreSQL). The `SpatiaLite cookbook <http://www.gaia-gis.it/gaia-sins/spatialite-cookbook-5/index.html>`_ is a good resource for learning what's possible with it.
To add a geometry column to an existing table, use the `sqlite-utils add-geometry-column` command::
You can convert an existing table to a geographic table by adding a geometry column, use the `sqlite-utils add-geometry-column` command::
$ sqlite-utils add-geometry-column spatial.db locations geometry --type POLYGON --srid 4326
The table (``locations`` in the example above) must already exist before adding a geometry column. Use ``sqlite-utils create-table`` first, then ``add-geometry-column``.
Use the ``--type`` option to specify a geometry type. By default, ``add-geometry-column`` uses a generic ``GEOMETRY``, which will work with any type, though it may not be supported by some desktop GIS applications.
Eight (case-insensitive) types are allowed:
* POINT
* LINESTRING
* POLYGON
* MULTIPOINT
* MULTILINESTRING
* MULTIPOLYGON
* GEOMETRYCOLLECTION
* GEOMETRY
Once you have a geometry column, you can speed up bounding box queries by adding a spatial index::
$ sqlite-utils create-spatial-index spatial.db locations geometry