Reduced size of buffer

The previous buffer size caused an issue with very small objects (small lakes or ponds) in such a way that the result of the buffer operation would be totally deformed geometry, then causing large tiles to be classified as coastal down the line. It's not clear to me what the root of the problem is, but a small non-zero buffer size seems to do the trick.

\approve @ds @laurens

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should quadkeys.out be included in this merge request?

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• a69540ca - Reduced size of buffer

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No. Removed.

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• 5a0ccaa8 - Reduced size of buffer and fixed calculation errors on tiny water geoms

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Please squash

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• 2d3c496e - Reduced size of buffer and fixed calculation errors on tiny water geoms

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• ad806190 - Reduced size of buffer and fixed calculation errors on tiny water geoms

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Done.

I also added two small tweaks to this MR that also concern level-18 tiles with very small geometries.

• geometries with a hole (e.g. a pond) should now be correctly transformed to an Albers projection
• geometries with an isthmus (e.g. a small land bridge) that divides the tile into two separate water bodies should no longer be identified as duplicate water bodies

assigned to @ds and unassigned @prehn

assigned to @prehn and unassigned @ds

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approved this merge request

assigned to @prehn and unassigned @laurens