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Externalizing polygon shard detection (#146)

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* Start of externalizing polygon shard detection

* Completely untested external quicksort

* Add unit test for external quicksort

* Remember to clean up temporary files

* Sort and scan the vertices

* Bring over more vertex logic

* Make nodes from vertices

* Checkpoint on switching over to global shared nodes

* Do the thing

* Revert unintended change to coalesced linestring behavior

* Take shared nodes into account in early simplification

* Let it do more sorting in memory

* Fix overnoding of collinear linestrings

* Remove duplicate nodes, since only duplicate vertices now matter

* Remember to delete temporary files

* Fix out of bounds memory access below, apparently

* Fix the actual undefined behavior

* Still running out of memory in one case. Find out where.

* Forgot the conditional

* Try again to make it not run out of memory

* Update version and changelog
This commit is contained in:
Erica Fischer
2023-10-03 10:53:12 -07:00
committed by GitHub
parent dcc3a11915
commit 26bf08deb2
18 changed files with 713 additions and 230 deletions
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README.md
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@@ -492,7 +492,7 @@ the same layer, enclose them in an `all` expression so they will all be evaluate
* `-ps` or `--no-line-simplification`: Don't simplify lines and polygons
* `-pS` or `--simplify-only-low-zooms`: Don't simplify lines and polygons at maxzoom (but do simplify at lower zooms)
* `--simplification-at-maximum-zoom=`_scale_: Use the specified _scale_ at maxzoom instead of the standard simplification scale (which still applies at lower zooms)
* `-pn` or `--no-simplification-of-shared-nodes`: Don't simplify away nodes that appear in more than one feature or are used multiple times within the same feature, so that the intersection node will not be lost from intersecting roads. (This will not be effective if you also use `--coalesce`.) For polygons, the vertices where polygon rings meet will be detected, and the shared edges between the polygons will be simplified identically if possible. Use this instead of `--detect-shared-borders`.
* `-pn` or `--no-simplification-of-shared-nodes`: Don't simplify away nodes at which LineStrings or Polygon rings converge, diverge, or cross. (This will not be effective if you also use `--coalesce`.) In between intersection nodes, LineString segments or polygon edges will be simplified identically in each feature if possible. Use this instead of `--detect-shared-borders`.
* `-pt` or `--no-tiny-polygon-reduction`: Don't combine the area of very small polygons into small squares that represent their combined area.
* `-pT` or `--no-tiny-polygon-reduction-at-maximum-zoom`: Combine the area of very small polygons into small squares that represent their combined area only at zoom levels below the maximum.
* `--tiny-polygon-size=`_size_: Use the specified _size_ for tiny polygons instead of the default 2. Anything above 6 or so will lead to visible artifacts with the default tile detail.