# Data license and attribution

The MIT license in LICENSE applies to this project's software, not the geographic data or generated assets.

The official [2026 N03 Administrative Areas page](https://nlftp.mlit.go.jp/ksj/gml/datalist/KsjTmplt-N03-2026.html), checked on October 11, 2026, identifies the dataset as **Open Data (CC BY 4.0)**, dated January 1, 2026. The coordinates are JGD2011 longitude/latitude. See [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) and the linked [MLIT terms](https://nlftp.mlit.go.jp/ksj/other/agreement_01.html). Commercial reuse, modification and redistribution are permitted subject to attribution, indicating changes, retaining applicable notices, and other license requirements. No independent MIT license is assigned to generated data.

Suggested credit, including a link when practical:

> Source: Ministry of Land, Infrastructure, Transport and Tourism, National Land Numerical Information (Administrative Areas, N03, January 1, 2026), https://nlftp.mlit.go.jp/ksj/gml/datalist/KsjTmplt-N03-2026.html, CC BY 4.0. Processed with japan-map-assets: municipal boundaries dissolved to prefectures and simplified; SVGs projected; video SVGs reposition southern islands into insets.

The source page identifies GSI Numerical Map (Basic Geospatial Information), GSI tiles, and MIC local government codes as original materials and records GSI reproduction approval R 7JHf 351. Some boundaries are provisional in the source. This tool preserves supplied boundaries and does not resolve disputed or undetermined boundaries. It does not constitute an official boundary determination.

Check the dataset-specific conditions before using a different source release. An input's provenance is supplied by the user, never inferred from its geometry. `manifest.json` records source date, input SHA-256, acquisition metadata when available, settings and output SHA-256. Pass `--source-date` and `--acquired-date` for manually obtained data. Keep this notice and provenance with redistributed assets.