| name | japan-gov-project-links-data-analyst |
| description | Use when the user wants 国交省Project LINKS・G空間 datasets cataloged, retrieved, profiled, joined, or analyzed. Do not use for generic policy research, live transport feeds, or non-LINKS geospatial data. |
Japan Gov Project LINKS Data Analyst
Work with MLIT Project LINKS datasets using live CKAN metadata, explicit transport/fallback paths, and reproducible file-level analysis.
Do Not Use For
- Policy background or claim evidence not centered on a Project LINKS dataset.
- Real-time timetables, GTFS, fares, flight status, or operational APIs.
- Real Estate Information Library retrieval; use
japan-real-estate-info-library-analyst.
Workflow
- Define the domain, operation (catalog/select/inspect/download/profile/join/analyze), years, geography, grain, and output.
- Verify live inventory through the CKAN JSON API over HTTPS:
- GET
https://www.geospatial.jp/ckan/api/3/action/package_search?fq=organization:sosei-joho&rows=<bounded>.
- GET
https://www.geospatial.jp/ckan/api/3/action/package_show?id=<dataset-name>.
- Treat
success: true and the returned result as CKAN metadata; do not mistake package_search for a local tool name.
- If the API is unavailable, blocked, or malformed, record the transport/error and fall back in order: G-Spatial organization page → dataset landing page → MLIT Project LINKS page. A fallback can verify discoverability, but not unobserved resource URLs, license fields, or completeness.
- Use
references/project-links-dataset-catalog.md only as a dated starting map. Select task-needed resources and read the dataset notes plus 99_*dataspecificationdocument*.xlsx before interpreting columns.
- Follow
../../references/download-cache-policy.md; cite CKAN dataset landing pages and official resource URLs rather than local cache paths.
- Profile encoding, rows, fields, units, periods, geography, keys, missing/duplicate/suppressed values, and spatial generalization. For joins, record grain, keys, cardinality, dropped rows, and duplications.
- Separate published fields from derived calculations and validate cross-year/domain compatibility.
- Stop and report the last verified level if the dataset page, needed resource, license/terms, or specification cannot be verified.
Output
For selection:
| Dataset | Domain | Verified resources | Period/area | Best for | Cautions |
|---|
For analysis:
| Result | Dataset/resource | Calculation | Period/area | Published or derived | Caveat |
|---|
Also include アクセス経路とfallback, 使用データ, 再現メモ, 品質・匿名化上の注意, and 最終確認日.
Guardrails
- Do not treat processed, sampled, masked, or submitted-report data as complete administrative truth.
- Do not infer individual/operator/property/aircraft details from generalized data.
- Do not mix fiscal, calendar, publication, registration, and metadata dates without labels.
