# Data and software attribution

The demonstration uses historical U.S. Government public-domain surface data
of an unnamed quarry. GPSCS did not collect the data. No customer relationship,
site access, operator endorsement or current capture is implied. Omitting the
name does not anonymize the published coordinates.

| Distributed file | Source and transformation |
| --- | --- |
| `assets/quarry-data.js` | USGS 3DEP, project `CA_AZ_FEMA_R9_Lidar_2017_D18`, raster IDs 33392 and 41700. A 551 × 451 service export from nominal 1 m LiDAR-derived DEM data, resampled to approximately 4 m and encoded in 0.01 m increments. Encoding precision is not measurement accuracy. This is not a raw LiDAR point cloud. |
| `assets/quarry-texture.js` | USDA NAIP 2022 imagery, distributed by USGS The National Map, catalog IDs 20308 and 20313, acquisition date May 14, 2022. Nominal 0.6 m imagery exported to JPEG, resized to 1600 pixels on its longest side and recompressed. One embedded image serves both 3D and fallback. |
| `assets/quarry-drainage.js` | Derived from `assets/quarry-data.js` above, with no new source data: flow paths and ponding basins computed offline from that elevation excerpt by the GPSCS drainage engine (`tools/build-quarry-drainage.py`). It records terrain routing only; it measures no water. |
| `js/vendor/three.min.js` | Three.js 0.160.1, copyright Three.js Authors, MIT license. Full notice in `js/vendor/THREE-LICENSE.txt`. |

Raw service exports are excluded from the website package and version control.
`tools/fetch-quarry-sources.py` retrieves them into ignored `data/`. Original
requests, catalog IDs, bounds, source URLs and recorded hashes are in
`SOURCES.json`. Live service responses may change; the fetcher checks hashes
and requires review before accepting changed sources.

Elevation and imagery come from different acquisition periods. The DEM's
vertical datum and absolute positional accuracy have not been independently
verified. Negative source elevations are retained. The browser exaggerates
3D relief by 1.5× and simplifies the mesh further.

All underground materials, ERT-like values, boreholes, probabilities and
verification priorities are synthetic. The fictional dashboard uses a separate
procedural surface. Neither is evidence about the quarry's reserves or geology.

The scan display samples the DEM as points; it does not load raw laser returns.
The subsurface volume extends a 2D synthetic scenario across an unmeasured
160 m display swath. The drainage display derives strict downhill routes from
a simplified DEM; it retains depressions and does not model water depth,
rainfall or quarry infrastructure. See README.md for the method and limits.

Source services:

- [USGS 3DEP elevation service](https://elevation.nationalmap.gov/arcgis/rest/services/3DEPElevation/ImageServer)
- [USGS distribution of USDA NAIP imagery](https://imagery.nationalmap.gov/arcgis/rest/services/USGSNAIPImagery/ImageServer)