A curated list of resources for the Global Entity Reference System (GERS), Overture Maps Foundation's open framework for assigning stable, persistent UUIDs to geographic entities.
GERS solves the "conflation tax": the recurring cost of re-matching your dataset to every new data release. Every feature in Overture carries a GERS UUID. Bridge files map those UUIDs to source IDs (OSM, Microsoft, Meta, etc.), so any dataset linked to GERS once stays linked across releases. Think of it as a persistent join key for the physical world.
Reached General Availability June 25, 2025. In OGC community standard process as of early 2026.
- GERS Overview: Product landing page covering what GERS is, the partner ecosystem, and entry points to technical docs.
- What is GERS?: Core technical reference covering IDs, changelogs, the registry, and bridge files.
- GERS Tutorial: Step-by-step guide to querying Overture via GERS IDs using DuckDB.
- GERS Registry: Queryable Parquet index of all stable GERS IDs across every Overture release (S3/Azure).
- Bridge Files: Per-release join tables mapping GERS UUIDs to source dataset IDs (OSM, Meta, Microsoft, Esri, and more).
All six themes are published monthly under open licenses and are fully GERS-tagged. Access via s3://overturemaps-us-west-2/release/ or Azure equivalent.
- Overture on AWS Open Data: 64M+ places, 2.6B+ buildings, 447M+ addresses, 321M+ road segments: all carrying GERS UUIDs.
Pre-built cross-walk tables at s3://overturemaps-us-west-2/bridgefiles/<release>/. Current coverage:
| Source | Theme(s) |
|---|---|
| OpenStreetMap | Buildings, Places, Divisions, Transportation |
| Microsoft ML Building Footprints | Buildings |
| Meta Places | Places |
| Esri Community Maps | Buildings, Divisions |
| PinMeTo | Places |
| geoBoundaries | Divisions |
| Instituto Geográfico Nacional (Spain) | Buildings |
- Regrid Parcel × GERS Bridge: 11M+ Overture place IDs matched to 8M+ U.S. parcels; three-field join table (
ll_uuid,gers_id,geoid). Available to Regrid bulk data customers.
- overturemaps-py: Python CLI + library. Includes a
gers <UUID>subcommand that queries the GERS Registry and returns a feature as GeoJSON or GeoParquet. - match-inspector: Local Flask/Folium web app for manually reviewing building conflation candidates before GERS ID assignment.
- osm-pbf-parquet: Rust CLI converting OSM PBF → Parquet; feeds the OSM-to-GERS conflation pipeline.
- overture-tiles: Generates PMTiles from Overture GeoParquet for map visualization and QA of GERS-identified features.
- overture-gers-tiles-example: Planetiler-based demo joining Overture Places (GERS) to Regrid parcel zoning data to produce enriched vector tiles; Dallas, TX case study. (Live map)
- OvertureMapsDownloader: Python/DuckDB downloader with a browser app (DuckDB-WASM) for client-side queries against Overture Parquet including GERS columns.
- overtureR: R package loading Overture datasets (with GERS ID columns) as dbplyr/sf data frames.
- Fused GERS UDFs: Serverless UDFs exposing HTTPS endpoints to spatially join any polygon dataset to Overture building GERS IDs; exploits H3 encoding for efficient filtering.
- overture-geocoder: Serverless geocoder on Cloudflare Workers backed by Overture Maps data; supports forward/reverse lookup and direct GERS ID resolution via edge-cached SQLite shards (Rust + Python).
- CARTO + Databricks: Overture data (all six themes, GERS IDs included) published as Databricks Marketplace listings; enables direct SQL joins on GERS IDs without ETL.
- Esri ArcGIS / Living Atlas: Workflow for enriching user data with GERS IDs inside ArcGIS Online and ArcGIS Pro using Living Atlas Overture layers.
- Wherobots (Apache Sedona): Cloud-native access to Overture GeoParquet via Apache Sedona/Spark; native GERS support for large-scale spatial joins.
- TomTom Global Entity Matcher (GEM): Commercial deep-learning conflation service that maps any client dataset to GERS IDs.
- Precisely Data Link: Pre-built link tables connecting PreciselyID, D&B DUNS numbers, Regrid property IDs, and GeoX IDs to GERS Places, Addresses, and Buildings.
- GERS Workshop Module: Official hands-on lab: querying GERS IDs, joining bridge files, querying the changelog, and enriching external datasets: all in DuckDB. Runnable in GitHub Codespaces.
- Conflating Overture Places with DuckDB, Ollama, and Embeddings: Detailed walkthrough matching a restaurant inspection dataset to Overture Places using DuckDB spatial joins, string similarity, and LLM embeddings. Referenced in official Overture GERS docs.
- Mapping GERS IDs to US Census FIPS Codes: DuckDB spatial join enriching GERS buildings with Census FIPS codes; canonical example of GERS as a cross-dataset join key.
- Enhance Your Data with GERS IDs (Fused): Spatially join any dataset to Overture buildings via a public Fused UDF endpoint; no backend required.
- GERSifying Overture Places (CARTO): End-to-end GERSification workflow in CARTO using an earthquake risk analysis as the use case.
- GERS in Wherobots: Step-by-step Wherobots notebook linking records across datasets using GERS IDs on Spark.
- SE Radio 694: Jennings Anderson & Amy Rose on Overture Maps: In-depth interview on GERS, stable IDs, dataset scale (4.2B features), and interoperability. November 2025.
- FOSS4G NA 2024: Overture Map Data: What, Why, & How: Recorded session by Steven Pousty and Jennings Anderson; GERS coverage starts around the data model section.
- FOSS4G 2024: Jennings Anderson (Overture/GERS): Belem talk on GERS enabling cross-dataset entity reference across organizations.
- Overture GA + Beyond AMA: Panel with Amy Rose, Jennings Anderson, Pascal Clarysse, and Marc Prioleau; GERS design rationale discussed at length. August 2024.
- Eliminating the Data Onboarding Tax (CARTO SDSC): Drew Breunig presents GERS as the solution to the recurring cost of geospatial data integration. December 2025.
- Towards Standardizing Place: Drew Breunig's influential argument that GERS has a real shot at making "place" a stable data primitive.
- Eliminating the Conflation Tax (GeoBuiz 2025 recap): Framing piece from Overture on the problem GERS solves.
- Understanding Overture's Global Entity Reference System: Deep-dive on GERS components (reference map, changelogs, registry, bridge files) written at GA launch.
- The Battle for the Map: Long-form analysis of OSM community concerns around the OGC GERS standardization effort.
- SimonPoole's Diary: Persisting Your IDs: OSM community perspective on persistent IDs and the tradeoffs in the GERS approach.
- Addresscloud: Geospatial Risk Analysis at Scale: Insurance risk scoring of 300M building footprints using GERS; in production since March 2024.
- Precisely: Accelerating Data Integration: Pre-linked GERS IDs across Places, Addresses, and Buildings; turns months of conflation into instant ID joins.
- Regrid: Connecting Parcels and POIs: Nationwide US parcel-to-GERS bridge enabling enriched site selection analytics.
- opengeospatial/Overture-Maps-GERS: OGC Standards Working Group charter and draft GERS community standard documentation; 40+ supporting organizations.
- OGC Public Comment: GERS as an OGC Community Standard: RFC from February 2026 seeking adoption of GERS as a formal OGC standard.
- OvertureMaps/schema: Schema working group repo governing GERS ID format and Overture data schema design.
Contributions welcome. Please open a PR with a short description of what you're adding and why it belongs here. Links should be to specific resources (not homepages), publicly accessible, and meaningfully related to GERS: not just Overture in general.