feat: Add GSI (国土地理院) data integration for Japan#6
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Add --gsi flag to use building and elevation data from Japan's Geospatial Information Authority (国土地理院) for much better coverage of Japanese areas. Buildings: - Fetch building polygons from GSI optimal_bvmap vector tiles - Parse MVT/Protobuf format and convert to OSM-compatible data - Merge with OSM data (typically 3-4x more buildings in Japan) - Local tile caching for offline reuse Elevation: - When --gsi + --terrain, use GSI DEM (5m/10m precision) instead of AWS Terrarium (~30m precision) - GSI DEM PNG 24-bit signed integer decoding - Separate cache prefix to avoid conflicts with Terrarium tiles GUI: - Add "GSI Buildings (Japan)" checkbox in Settings Data source: https://maps.gsi.go.jp/development/vt.html License: Free with attribution (国土地理院) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Add --gsi flag to use building and elevation data from Japan's Geospatial Information Authority (国土地理院) for much better coverage of Japanese areas.
Buildings:
Elevation:
GUI:
Data source: https://maps.gsi.go.jp/development/vt.html
License: Free with attribution (国土地理院)