Add --cluster-maxzoom option
#75
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Originally #33:
This PR adds the option to set the maximum zoom level at which features should be clustered. Syntax taken from the updated docs:
-kzoom or--cluster-maxzoom=zoom: Max zoom on which to cluster points if clustering is enabled.-kgor--cluster-maxzoom=g: Set--cluster-maxzoom=tomaxzoom - 1so that all features are visible at the maximum zoom level.I just picked the letter
kas it was available, but this could be change to anything else if needed.An alternative solution would be to use the already existing
--base-zoomoption to prevent clustering above the specified zoom. While possible, it could lead to unexpected result when using both-zgand-Bg, as the zoom at which most feature would be become distinct could be much higher than the one at which a tile crosses the 50k feature limit.Fixes mapbox/tippecanoe#934 and mapbox/tippecanoe#799.
This PR, alongside mapbox/tippecanoe#940 and #32 would bring feature parity and improved consistency with the supercluster library used to generate clusters in
mapbox-gl-js.