china-admin-boundaries

Documents

Official, standards-compliant vector boundaries of China's administrative divisions — province, city and county polygons. Use this whenever a task needs China's administrative-area boundaries, instead of downloading them from OSM / Natural Earth / GADM, whose depiction of China's borders is not compliant with China's official standard.

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Source SKILL.md: https://github.com/zzhonglei/GeoCode-Release/blob/HEAD/contributions/china-admin-boundaries/skill/SKILL.md

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China Administrative Boundaries

GeoCode's bundled official, compliant polygons of China's administrative divisions, sourced from Tianditu (China's national geospatial platform) and following the national mapping standard. Whenever a task needs China's province / city / county areas, use these — do not download them from OSM / Natural Earth / GADM, whose border depiction is not compliant for use in mainland China.

Data

Three GeoJSON files in this skill's data/ directory (use the absolute path provided to you), CRS WGS84 / EPSG:4326:

File	Level	Features
`china_province.geojson`	province	34
`china_city.geojson`	city (prefecture)	375
`china_county.geojson`	county / district	2891

Fields: adcode (6-digit code, unique key), name (Chinese name), gb (156 + adcode), level.

Selecting a unit

Select by adcode, not name — county-level names repeat. adcode is province(2) + city(2) + county(2), so prefix-match to drill down: 51 → all of Sichuan, 5101 → all of Chengdu.

Mapping note

These are analysis polygons only — they exclude the nine-dash line. To draw a whole-China map, use the thematic-map skill's china_base as the national frame (it carries the nine-dash line) and overlay these polygons as a thematic layer.