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This implements a prominence algorithm for point features such as cities/towns or mountain peaks.
The Lua profile sets a
Scorefor each affected point feature. These are written to a separate, temporary store of scored features rather than the main datastore.Then, before writing, tilemaker iterates through each zoom level and chooses the highest scoring features that both exceed a set threshold and aren't within n pixels of an already-placed feature. The threshold halves per zoom level.
The implementation is based on an original Ruby/PostGIS implementation used in cycle.travel's raster rendering, and ported to C++ with Claude.