Changelog

2026-05-21-v0

Snapshot inputs

Conflated output

Methods changes vs. prior release

• Change detection (new). Post-conflation pass that reconstructs "ghost" POIs from OSM history (deleted or renamed nodes) and uses them to penalize unmatched Overture POIs that shadow-match a ghost. Penalty multiplies the Overture row's conf_mean by the per-shared_label δ from the fitted turnover model. 47,925 rows penalized this run. Adds audit columns to every conflated row: shadow_matched, shadow_ghost_id, shadow_event_type, shadow_event_timestamp, shadow_score, shadow_distance_m, original_conf_mean. PR #29; design in docs/change-detection.md.
• US territory expansion. Spatial footprint widened from CONUS + PR to include all US territories (PR, USVI, GU, MP, AS). Affects both snapshots and the conflation domain. PR #31.
• Wider metadata propagation. Additional OSM and Overture metadata fields now flow through to the conflated parquet (website, wikidata, wikipedia, etc.). PR #30.
• PMTiles re-tuned. Zoom range narrowed to Z10–Z14 with --drop-densest-as-needed, so feature drops cascade through low zooms instead of failing tile builds. Site updated with zoom-aware point styling. PR #33.
• Covering bbox in partitioned parquet. GeoParquet 1.1 bbox struct column emitted via write_covering_bbox=True, enabling DuckDB row-group pruning on viewport queries. PR #32.
• Overture release pinned. download.overture.release_date set to 2026-05-20.0 (was null = auto-detect latest). Future runs against the same pin are deterministic.
• Pipeline memory hardening (uncommitted on lifecycle/may-2026-release). Both apply_change_detection.py and the partitioned-write helper hit the 24 GB WSL cap on nationwide inputs. The CD writer now mutates in place and streams the output parquet in row-group chunks via pyarrow.parquet.ParquetWriter; the geohash partition writer drops one full-partition copy (numpy argsort + instead of pandas ) and streams large partitions in chunks. See and .

Taxonomy changes

Overture crosswalk (src/openpois/conflation/data/taxonomy_crosswalk_overture_maps.csv, uncommitted on lifecycle/may-2026-release): 7 new entries under services_and_business.family_service, previously unmapped and dropped from the partitioned output.

This is the proximate cause of the +22,715 row jump (+8.45%) in Other Professional.

No OSM-side taxonomy changes since 2026-04-23.

Top label-level row-count changes

Drivers:

• Most positive movers (Specialty Store, Clothing Store, Car Dealer, Supermarket, Bakery, Charging Station) track Overture's snapshot growth (+2.5% overall) landing in shared labels with moderate base counts.
• Other Professional also reflects the new family_service crosswalk entries above.
• Other Healthcare dropping by ~20k against a larger Overture snapshot is worth a closer look — likely an Overture taxonomy reshuffle inside health_and_medical upstream. Flagged for QA, not blocking.

Version pins