Owner decision: adopt the two findings from the Mapbox cross-check.
- LEVEL_HEIGHT 3.2 -> 3.1 m in block_height_report.py and the Blosm
--level-height default; every levels-derived building drops ~0.6 m per 6
levels, matching Mapbox.
- HEIGHT_OVERRIDES for the three rear building=yes/apartments structures that
Mapbox gives as single storey (3.0 m) where our 2-level fallback rendered
6.4 m blocks.
- classify_height() takes an optional way_id so overrides apply; the Mapbox
cross-check passes it and now reports 66 match / 6 non-building / 0 disagree.
- Geometry follows: blockout regenerated at 3.1 (frontage object names
preserved, 6/6 exported), frontage re-imported, DemoMap rebuilt, packaged
-qaselftest PASS (walk, reset, pause, transect 0 holes, wall probe 0/35).
- Docs: Art/blender/README scale table + a note that Blosm adds ~1.9 m roof mass
above levels x levelHeight; TODO item closed; MEMORY records the gotcha that
blockout regeneration must re-verify the element.* frontage mapping.
Tools/terrain_from_dem.py builds a 191x106 grid at 2 m over the block, Z being
NAVD88 minus the origin ground. Building footprints from the OSM extract are cut
out so rooftops never become terrain (72 footprints, 6310 cells). Spot checks
reproduce the measured profile: origin 0.00, Orange Dr +3.39, south gutter
+0.93, crown +1.38, north sidewalk +1.43.
Blosm projects with a sphere, not an ellipsoid, so its frame was ~0.4% oversized
and rotated by meridian convergence: about 2 m at the theatre. The blockout now
fits a six-parameter affine into EPSG:26911 on five control points (0.0 cm
residual) and transforms root objects only, since children inherit and double
transforming them read as a 2 m placement error.
Tools/blosm_blockout.py imports the committed extract in 3Dsimple mode and
reports per-building dimensions so a units failure is visible in the log. The
result (87 meshes) is committed as the blockout baseline: hero 25.68 x 54.88 x
14.50 m against 25.75 x 54.88 m of OSM geometry, so the import is 1:1 metres.
Two headless defects needed working around: the asset-directory check that
fires before mode is honoured, and an empty default-level table sending the
add-on down a broken relative import. Member fetching stays off so the import
does not depend on Overpass.
zwitschi