recon

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Author	SHA1	Message	Date
Matt	3d2d69cd56	Switch /api/reverse/<lat>/<lon> elevation source from Valhalla to planet-DEM Per OFFROUTE-ARCHITECTURE.md §9 ("planet-dem.pmtiles as single elevation source"). The bundle endpoint previously called Valhalla /height, which only has 48 Idaho HGT tiles; it now reads the planet-scale Terrarium PMTiles that already back the frontend hillshade and contours. - dem.py: add DEMReader.sample_point(lat, lon) — one z12 tile (LRU-cached), Web-Mercator pixel index, None outside the +/-85.05 pole cap or when untiled. - netsyms_api.py: module-level DEMReader singleton (lazy mmap, None if init fails); _reverse_elevation now calls _DEM.sample_point; drop the Valhalla HTTP call and _VALHALLA_HEIGHT_URL. - tests: DEM-mock and DEM-unavailable cases; EXPECTED_KEYS derives from _BUNDLE_KEYS. All 9 tests pass. Verified live: Boise 824m, London 8m, Tokyo 35m, Yosemite 2804m, pole -> None. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>	2026-05-20 15:20:35 +00:00
Matt	f2a0f81580	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>	2026-05-07 23:43:56 +00:00

Author

SHA1

Message

Date

Matt

3d2d69cd56

Switch /api/reverse/<lat>/<lon> elevation source from Valhalla to planet-DEM

Per OFFROUTE-ARCHITECTURE.md §9 ("planet-dem.pmtiles as single elevation
source"). The bundle endpoint previously called Valhalla /height, which only
has 48 Idaho HGT tiles; it now reads the planet-scale Terrarium PMTiles that
already back the frontend hillshade and contours.

- dem.py: add DEMReader.sample_point(lat, lon) — one z12 tile (LRU-cached),
  Web-Mercator pixel index, None outside the +/-85.05 pole cap or when untiled.
- netsyms_api.py: module-level DEMReader singleton (lazy mmap, None if init
  fails); _reverse_elevation now calls _DEM.sample_point; drop the Valhalla
  HTTP call and _VALHALLA_HEIGHT_URL.
- tests: DEM-mock and DEM-unavailable cases; EXPECTED_KEYS derives from
  _BUNDLE_KEYS. All 9 tests pass.

Verified live: Boise 824m, London 8m, Tokyo 35m, Yosemite 2804m, pole -> None.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-20 15:20:35 +00:00

Matt

f2a0f81580

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>

2026-05-07 23:43:56 +00:00

2 commits