Chris Hill-Scott 858d1ee197 Increase threshold for minimum polygon size ...

We filter out very small polygons from the original data to remove
glitches. These glitches are caused by trying to subtract the water from
a polygon that includes some land and some water, but using two
different definitions or resolutions of mean high water line.

If we don’t do this then we end up with a bunch of very small polygons
which lie far outside the understood area of a place, causing large
overspill.

We need to increase the threshold for this process because we’re still
seeing this problem around Bristol and Norwich.

This does mean we lose a few very small polygons in places like Shetland
and the Scilly Isles, but not in such a way that we would avoid
broadcasting to them (because they’d still be caught by the
simplification and overspill).

2020-09-14 11:32:02 +01:00

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