[missinglink]

this PR adds support for the Overture Maps division and division_area themes.

note: the overturemaps cli command is required to download the data.
note: requires duckdb

[missinglink]

I added a second commit which changes the ingress from the official OvertureMaps CLI to duckdb wrapped in a helper function (embedded below).

This has advantages of us being able to perform arbitrary SQL queries and not be limited to the available functionality of the official CLI (plus we don't need to install a python app).

spatial/README.md

Lines 304 to 346 in 867450e

	# Overture Helper Function
	The Overture import requires a bash helper function to query DuckDB against S3 parquet files. Copy this function to your shell or save it to a file and source it:
	```bash
	overture_export_geojson_by_bbox() {
	local theme="${1:?Missing theme (e.g., divisions, buildings, places)}"
	local type="${2:?Missing type (e.g., division_area, division_boundary)}"
	local xmin="${3:?Missing xmin (western longitude)}"
	local ymin="${4:?Missing ymin (southern latitude)}"
	local xmax="${5:?Missing xmax (eastern longitude)}"
	local ymax="${6:?Missing ymax (northern latitude)}"
	local OVERTURE_RELEASE="2026-09-23.1"
	local S3_BASE="s3://overturemaps-us-west-2/release/${OVERTURE_RELEASE}"
	duckdb -noheader -list -c "
	INSTALL spatial; LOAD spatial;
	WITH data AS (
	SELECT *, row_number() OVER () as rn
	FROM read_parquet('${S3_BASE}/theme=${theme}/type=${type}/*', filename=true, hive_partitioning=1)
	WHERE bbox.xmin < ${xmax} AND bbox.xmax > ${xmin}
	AND bbox.ymin < ${ymax} AND bbox.ymax > ${ymin}
	)
	SELECT json_object(
	'id', data.id,
	'type', 'Feature',
	'geometry', ST_AsGeoJSON(data.geometry)::JSON,
	'properties', (SELECT to_json(r) FROM (SELECT * EXCLUDE (id, geometry, filename, theme, type, rn) FROM data d WHERE d.rn = data.rn) r)
	)
	FROM data;
	"
	}
	```
	**Usage:**
	```bash
	# Export division areas for New Zealand
	overture_export_geojson_by_bbox divisions division_area 165 -48 179 -34
	# Export division points for Indonesia
	overture_export_geojson_by_bbox divisions division 106 -7 107 -6
	```