Added function to fetch inland-water bodies from database
This adds
- a function
inland_waterbodies
that fetches inland-water bodies from a database and returns inland water polygons and coast linestrings for a quadkey. - a function
expand_waterbodies
that aims at merging said polygon data with the sea-water polygons that already have been processed - likewise a function
expand_coast
that does the same, to combine existing sea-coastline with inland-coastline - some helper functions
- lots of tests to guarantee that the functions work as expected
Edited by Karsten Prehn