Some state (region) label points are dropped at some early zooms about basemaps HOT 4 CLOSED

Consider moving the sortKey transform to post processing step...

from basemaps.

Consider also varying the number of kept features by zoom (or limiting the size of the grid by zoom) – and limiting to just locality kinds.

Right now we do a combination:

  feat.setPointLabelGridSizeAndLimit(13, 64, 4); // each cell in the 4x4 grid can have 4 items

But we could split that apart so the Size is constant but the limit varies by zoom:

    feat.setPointLabelGridLimit(LOCALITY_GRID_LIMIT_ZOOM_FUNCTION);

or

    feat.setPointLabelGridSize(LOCALITY_GRID_SIZE_ZOOM_FUNCTION);

Where LOCALITY_GRID_LIMIT_ZOOM_FUNCTION might look like:

private static final ZoomFunction<Number> LOCALITY_GRID_LIMIT_ZOOM_FUNCTION = ZoomFunction.fromMaxZoomThresholds(Map.of(
    7, 2,
    8, 4,
    9, 6,
    10, 8
    11, 10
  ), 0);

With the zoom breaks adapted from Tilezen, where no thinning is done from zoom 0 to 6 inclusive (as Natural Earth is pre-compiled).

• https://github.com/tilezen/vector-datasource/blob/master/queries.yaml#L1106-L1170

from basemaps.

It's unclear if you can limit the label grid to apply to certain features versus all features in a layer (eg just locality kinds).

from basemaps.

label grid applies to all features in a layer. another option is just making buckets way bigger at low zooms and then doing some post-processing

from basemaps.