wklsr: Well-Known Locations in R

wklsr is the R port of wkls and makes it easy to find global administrative boundaries — from countries to cities — using readable, chainable R syntax.

It fetches geometries from a mirror of Overture Maps Foundation GeoParquet data (version 2025-11-19.0) hosted on HuggingFace.

You can instantly get geometries in formats like Well-known Text (WKT), Well-known Binaries (WKB), HexWKB, GeoJSON, and SVG:

library(wklsr)

# prints "MULTIPOLYGON (((-122.5279985 37.8155806...)))"
print(wkls$us$ca$sanfrancisco$wkt())

#prints "2025-11-19.0"
print(wkls$overture_version())

Installation

install.packages(wklsr)

This command also loads DuckDB with its related spatial extension.

Quick Start

After installing wklsr, run the following commands to get started:

library(wklsr)

# Get country geometry
usa_wkt <- wkls$us$wkt()
print(sprintf("USA geometry: %s...", substr(usa_wkt, 1, 50)))

# Get state/region geometry
california_geojson <- wkls$us$ca$geojson()

# Get city geometry
sf_svg <- wkls$us$ca$sanfrancisco$svg()

# Check dataset version
print(sprintf("Using Overture Maps data: %s", wkls$overture_version()))

# Explore available data
print(sprintf("Countries: %d", nrow(wkls$countries())))
print(sprintf("Dependencies: %d", nrow(wkls$dependencies())))
print(sprintf("US regions: %d", nrow(wkls$us$regions())))
print(sprintf("CA counties: %d", nrow(wkls$us$ca$counties())))

Handling namespace collisions

Usage

Accessing geometry

wklsr supports up to 3 chained attributes: 1. Country/Dependencies (required) – must be a 2-letter ISO 3166-1 alpha-2 code (e.g. us, de, fr) 2. Region (optional) – must be a valid region code suffix as specified by Overture (e.g. ca for US-CA, ny for US-NY) 3. Place (optional) – a name match against subtypes: county, locality, or neighborhood

Examples:

wkls$us$wkt()                          # country: United States
wkls$us$ca$wkt()                       # region: California
wkls$us$ca$sanfrancisco$wkt()          # city/county: San Francisco
wkls[["us"]][["ca"]][["sanfrancisco"]]$wkt() # dictionary-style access

Supported formats

wklsr supports the following formats:

• $wkt() – Well-Known Text
• $wkb() – Raw binary WKB
• $hexwkb() – Hex-encoded WKB
• $geojson() – GeoJSON string
• $svg() – SVG path string

Example: Find the administrative boundary of San Francisco, California

Chained expressions like wkls$us$ca$sanfrancisco return a WKL object. Internally, this wkls_proxy object containing one or more rows that match the given chain.

        id           country    region   subtype       name     
0  085718963fffff...   US       US-CA    county    San Francisco

In most cases, wklsr resolves to a single administrative boundary. But if there are name collisions (e.g., both a county and a locality called “San Francisco”), multiple rows may be returned.

By default, geometry methods like $wkt() will use the first matching row.

Helper methods

The following methods return Pandas DataFrames for easy exploration:

Some countries/dependencies may not have regions, so for those countries/dependencies you can directly call either $counties() or $cities(), to further explore the available data$

wkls$fk$cities()

Dataset information

You can check which version of the Overture Maps dataset is being used:

print(wkls$overture_version())

> "2025-11-19.0"

Note: The overture_version() method is only available at the root level, not on chained objects like wkls$us$overture_version().

How It Works

wklsr works in two stages:

1. In-memory GERS ID resolution

Your chained attributes — up to 3 levels — are parsed in this order:

1. country/dependency → matched by ISO 2-letter code (e.g. "us")
2. region → matched using region code suffix as specified by Overture (e.g. "ca" → "US-CA")
3. place → fuzzy-matched against names in subtypes: county, locality, or neighborhood

This resolves to a wkls_proxy object containing metadata from the in-memory wklsr table (stored in DuckDB). At this stage, no geometry is loaded yet — only metadata (like id, name, region, subtype, etc.) is queried from the database. When you print the proxy object or call a geometry method, the actual data is retrieved via dbGetQuery().

2. Geometry lookup using DuckDB

The geometry lookup is triggered only when you call one of the geometry methods:

• $wkt()
• $wkb()
• $hexwkb()
• $geojson()
• $svg()

At that point, wklsr uses the previously resolved GERS ID to query the Overture division_area GeoParquet directly from S3.

The current Overture Maps dataset version can be checked with wkls$overture_version().

Contributing

License

This project is licensed under the Apache License 2.0. wklsr includes, references, and leverages data from the "Divisions" theme of Overture, from Overture Maps Foundation:

• © OpenStreetMap contributors. Available under the Open Database License.
• geoBoundaries. Available under CC BY 4.0.
• Esri Community Maps contributors. Available under CC BY 4.0.
• Land Information New Zealand (LINZ). Available under CC BY 4.0.

Acknowledgments

• Overture Maps Foundation for providing high-quality, open geospatial data.
• DuckDB for fast analytical queries with spatial support.
• AWS Open Data Registry for hosting the dataset.