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Add an option to drop more points in dense areas than in sparse areas (#35)

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* Add an option to drop the densest features by rate, not a fraction

* Restrict dot dropping just to dots, as it should be

* 50% mix of sparse and uniform point preservation

* Update version, changelog, test, and documentation

* 60% sparse, 40% dense

* Didn't update the test after the last change

* Make the drop-denser rate configurable without recompiling
This commit is contained in:
Erica Fischer
2022-11-16 10:55:07 -08:00
committed by GitHub
parent 622084a507
commit 7733cced43
7 changed files with 1849 additions and 17 deletions
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README.md
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@@ -453,6 +453,8 @@ the same layer, enclose them in an `all` expression so they will all be evaluate
If you use `-Bg`, it will guess a zoom level that will keep at most 50,000 features in the densest tile.
You can also specify a marker-width with `-Bg`*width* to allow fewer features in the densest tile to
compensate for the larger marker, or `-Bf`*number* to allow at most *number* features in the densest tile.
* `--drop-denser=`_percentage_: When dropping dots at zoom levels below the base zoom, give the specified _percentage_
preference to retaining points in sparse areas and dropping points in dense areas.
* `--limit-base-zoom-to-maximum-zoom` or `-Pb`: Limit the guessed base zoom not to exceed the maxzoom, even if this would put more than the requested number of features in a base zoom tile.
* `-al` or `--drop-lines`: Let "dot" dropping at lower zooms apply to lines too
* `-ap` or `--drop-polygons`: Let "dot" dropping at lower zooms apply to polygons too