union ocean regular squares into complex polygon (#1021)

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The ocean layer (table osm_ocean_polygon insert by `make import-data`) is made from squares that have a 10m buffer. 

This creates extra geometry in vector tiles as:

Union of full ocean squares should decrease the size of the water layer.

there are 8042 polygons (squares, 5 points, more then 100km<sup>2</sup>), which was reduced to 22 polygons - 1184kB vs 40kB respectively. 

In mbtiles should be the size reduction even more significant, due to the creation of more polygons based on a 10m buffer of each square.

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This commit is contained in:

Tomas Pohanka

2020-10-14 13:56:04 +02:00

committed by GitHub

parent 72165933be

commit b7429ce6f5

3 changed files with 38 additions and 14 deletions

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