zwitschi
d97fcc7ad4
550x350 m clipped to the block, already in the project CRS, 984 KB, committed through LFS. Verified against the service's own point query and the earlier probe: 115.911/119.422/117.593 m, agreement within 6 cm. Adds Geo/scripts/dem_stats.py, a stdlib tiled-TIFF reader, because GDAL cannot run on the host and the exported raster is tiled rather than strip-organised.
47 lines
2.8 KiB
Markdown
47 lines
2.8 KiB
Markdown
# Geo
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Geographic sources, manifests, and the scripts that turn them into Blender imports.
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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.
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## Layout
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| Path | Contents |
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| --- | --- |
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| `Geo/raw/` | Verbatim source responses, checksummed. Never edited by hand. |
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| `Geo/verification/` | Per-pass verification notes: address, footprint, bounds, and what remains unresolved |
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| `Geo/manifests/` | One manifest per saved extract (see below) |
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| `Geo/scripts/` | Repeatable fetch and conversion helpers |
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Current state: the extract, both El Capitan footprints, the demo bounds, the building sets, the street profile, and the designated crossing are recorded in [`verification/`](verification/). The local CRS and origin are fixed in [`manifests/local-origin.md`](manifests/local-origin.md), with the projected easting/northing still to be computed. Elevation is measured and the 3DEP 1 m DEM window is committed (EPSG:26911, NAVD88, 984 KB). The hero façade width remains open.
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## Required manifest
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Every extract gets a manifest file `Geo/manifests/<source>-<date>.md` recording:
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| Field | Example |
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| --- | --- |
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| Source | Overpass API / Geofabrik / OSM extract provider |
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| Extract date | date the query ran or the file was downloaded |
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| Query or file URL | the exact query text or download URL |
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| Data timestamp | OSM data date reported by the source (may differ from the extract date) |
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| Bounds | west, south, east, north in WGS84 decimal degrees |
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| Licence | ODbL 1.0, attribution string |
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| Checksum | SHA-256 of the committed file |
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| CRS and local origin | projected CRS plus the chosen origin, with its WGS84 coordinates |
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| Files | every file produced from this extract |
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## Demo bounds
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`0.1.0` covers 6840 Hollywood Blvd / El Capitan Entertainment Centre, buildings on the south side of Hollywood Boulevard between Highland Avenue and Orange Drive, and north-side buildings whose footprint lies within 50 m of the north frontage. Verify address, footprints, and boundaries against source data before modeling; anything unverifiable is recorded here as unresolved and is not modeled.
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## Coordinate convention
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- Work in a local projected CRS (EPSG:26911, NAD83 / UTM zone 11N, is the default candidate) and record the local origin explicitly.
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- Blender and Unreal both take metres → Unreal units at 1 m = 100 uu. The conversion is applied once, in one place, and recorded in the manifest. Never apply a second silent scale on import.
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- Preserve the original geographic coordinates in metadata so any asset can be traced back to its position.
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## Unresolved items
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Record here any structure whose address, footprint, or boundary could not be verified from permitted sources, with the sources checked. It does not get modeled.
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