The OpenHistoricalMap experiment
summary
OpenHistoricalMap runs on the OSM stack but extends it: 10+ years of work adds a custom vector rendering engine to power a time slider (raster tiles proved impossible), keeps compatibility by reusing OSM tags so Overpass queries work unchanged, and replaces the informal start_date approximations with EDTF (extended date time format) as the canonical date scheme. Heavy use of relations decouples geometry from metadata, exposes an relation nesting limit in the OSM API, and introduces a new relation type, chronology, now documented in OSM relation space.
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