zwitschi
386d4bee78
Geo/tools/ is now every geographic script, with Geo/README.md documenting each one; the Blender-side builders moved beside their outputs in Art/blender/*/ and import their helpers from Geo/tools/osm_common.py. That module gains to_unreal_local() and to_blender_local(): the only place in the repository that multiplies metres by 100, so a second silent scale cannot be introduced. block_height_report.py adds height provenance for the block — 3 of 15 buildings have no height data and render at a placeholder 6.4 m. asset_metadata.py writes and audits <asset>.geo.json sidecars; four now exist (hero-facade, terrain, street, blockout) and the audit recomputes each centre from the origin, failing anything that disagrees.
Geo
Geographic sources, manifests, and the tools that turn them into Blender and Unreal content.
OSM is layout data only. It is not authoritative for façade detail, height, or pavement, and it is never sampled as a texture or panorama source.
Layout
| Path | Contents |
|---|---|
Geo/raw/ |
Verbatim source responses and downloads, checksummed. Never edited by hand. |
Geo/manifests/ |
One manifest per source: extract, DEM, and the local origin |
Geo/verification/ |
Per-pass notes: address, footprints, bounds, street profile, cross-sections, elevation |
Geo/tools/ |
Every geographic tool (Python, standard library only unless noted) |
Tools that build 3D content from these sources live next to their output in Art/blender/*/ (terrain_from_dem.py, street_mesh.py, site_assembly.py, blosm_blockout.py) because they need Blender; their shared geo helpers and the unit conversion come from Geo/tools/osm_common.py.
Tools
| Tool | Purpose |
|---|---|
osm_common.py |
Shared helpers: parse .osm, stitch and clip a street, project to UTM through PROJ, and the single metres→centimetres conversion (to_unreal_local) |
block_report.py |
Streets, boundary intersections, and the building set for a block, split by side |
block_height_report.py |
Every block building with its height source — tag, levels × 3.2 m, or a placeholder guess |
street_profile.py |
Carriageway width from crossings, sidewalk offsets, per-building setbacks |
street_section.py |
Cross-sections from the DEM: crown, gutters, kerb detection |
elevation_probe.py |
Samples 3DEP for relief and records the baseline for the release checks |
dem_stats.py |
Stdlib reader for the tiled GeoTIFF the 3DEP service returns; GDAL does not run on this host |
asset_metadata.py |
Writes and audits <asset>.geo.json sidecars: position, provenance, conversion |
Unit boundary
There is exactly one conversion in the repository:
WGS84 (lat, lon) → EPSG:26911 (E, N metres) → project-local metres → Unreal centimetres
Geo/tools/osm_common.py::to_unreal_local is the only place that multiplies by 100. Per-asset sidecars record the result, and asset_metadata.py audit checks each saved sidecar against that function, so a file that drifts is caught rather than trusted.
Current state
The extract, both El Capitan footprints, the demo bounds, the building sets, the street profile, cross-sections, and the 3DEP DEM window are recorded in Geo/verification/ and Geo/manifests/. The local CRS and origin are fixed in manifests/local-origin.md.
Open items live in ROADMAP.md under Geographic data.