In our previous article 《「GIS Data」Download Updated National Administrative Division Codes》, we discussed methods to acquire administrative codes. A common application is powering location selection components in frontend systems, as shown below:

When recently requested for updated codes, we leveraged the GS(2024)0650 standard dataset from 《「GIS Data」2024 National Standard Vector Map (County-Level) Approval No. GS(2024)0650》 to extract codes directly from spatial data attributes.

Attribute-Based Data Extraction

The authoritative dataset contains administrative codes within its attribute table:

Preprocessing Workflow

  1. Open attribute table in QGIS
  2. Enable editing mode
  3. Use Field Calculator to process gb field:
    right(gb, 6)

  1. Verify processed attributes

Export Procedure

  1. Right-click layer → Export → Save Features As
  2. Configure output format (CSV/Excel) and fields

Convert CSV to JSON using online tools like https://csvjson.com/

Significance of Standardized Datasets

Using nationally approved maps (GS approval numbers) ensures:

  1. Regulatory Compliance: Mandatory for public publications and state-owned enterprises
  2. Data Authority: Officially verified administrative codes
  3. Audit Efficiency: Streamlined approval processes for derivative works

While alternative sources exist (OSM/GADM), they lack official validation and may create compliance challenges in professional applications.