GeoPackage

Warning

This package does not work yet!

GeoPackage.jl is designed to be a fast and mostly native Julia reader of GeoPackage (.gpkg) files.

It currently only supports geometry tables, and not tilesets or other raster variants. If you want to read such a table, use ArchGDAL.jl which can perform this reading.

How it works

The package has 2 main components:

1. An SQL query mechanism to obtain the various geometry tables from the .gpkg file
2. A method to parse binary representations of geometry into a Julia-native form.

Structure

• GeoPackage.DB: a holder to a database connection with established metadata
• DataFrame: returned from GeoPackage.get_table(::DB, name::String) - should we have our own table format? Why?

TODOs

• Optimized geometry parsing using known single-geometry columns to promote type stability and speed up the fast inner loop of parsing.
• Better checks and understanding the CRS aspect of the GeoPackage spec.
• Support for tiles and similar features.

We have access to z and m indicators in the gpkg_geometry_columns table so should use those as well.