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feat(offroute): Phase O1 foundation — PMTiles decoder, Tobler cost, MCP pathfinder prototype
- dem.py: Terrarium-encoded PMTiles tile reader with LRU cache
- Decodes WebP tiles from planet-dem.pmtiles
- Stitches tiles into numpy elevation grids for arbitrary bboxes
- Provides pixel-to-latlon coordinate conversion
- cost.py: Tobler off-path hiking cost function
- speed = 0.6 * 6.0 * exp(-3.5 * |grade + 0.05|) km/h
- Max slope cutoff: 40 degrees → impassable
- Returns time-to-traverse (seconds/cell) as cost metric
- prototype.py: Standalone validation on Idaho test bbox
- 43km × 80km bbox (~17M cells at 14m resolution)
- scikit-image MCP_Geometric Dijkstra pathfinder
- Outputs GeoJSON LineString with path metadata
- Validated: 61.6km path, 21.3 hours effort time
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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2026-05-07 23:43:56 +00:00 |
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