scripts/README.md

Pipeline scripts

These scripts reconstruct City3D-MultiGen from the source data, organized by city. Only the canonical (non-duplicate) version of each stage is kept.

melbourne/

Processing for the City of Melbourne 3D Point Cloud.

Script	Role
export_las_blocks_noKML.py	The full tiler: partitions the source LAS into 150 m tiles and produces the per-tile point cloud, DSM, and BEV render.
grid_from_kml.py	Builds the tile grid (metadata/*_grids.json) from the KML tile index.
Obtain_corresponding_map_signed.py	Fetches satellite + styled map from the Google Maps Static API and parses the per-class semantic masks. Reads GOOGLE_MAPS_API_KEY and GOOGLE_MAPS_URL_SIGNING_SECRET from environment variables.

holicity/

Processing for HoliCity (London) FBX meshes.

Script	Role
export_las_blocks_noKML.py	Samples point clouds from the meshes and tiles them (same full tiler as Melbourne).
convert_coord.py	Converts HoliCity local coordinates to geographic coordinates.
add_coord_head.py	Writes the geographic coordinate header onto each tile.
check_coord.py	Sanity-checks the coordinate alignment of generated tiles (optional utility).
Obtain_corresponding_map_signed.py	Fetches satellite + semantic maps (same Google API, your own key).

build_dataset.py

Top-level orchestrator: tiling → map fetching → DSM/BEV, assembling the per-tile layout described in the top-level README.

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⚠️ Before running

• Set your Google credentials as environment variables (see top-level README).
• API keys/secrets have been removed from these scripts and are read from the environment. Do not re-introduce hardcoded credentials — this repo is public.
• Edit the input/output paths at the top of each script to match your local layout.