# Credits

| Kind | Who | Note |
|---|---|---|
| Author | godosa | |
| Libraries | see [licenses.md](licenses.md) | |
| Tooling | AI assistance (Claude, Anthropic) | engineering tool; statement in README |

## Models and sources

Methods taken from papers, textbooks or other projects. Add a row in the same commit as the code.

| Source | Used for | Module |
|---|---|---|
| H3 hexagonal grid (Uber, h3geo.org) | world cells and neighbours | `grid.py` |
| Euler-pole plate kinematics (rigid plates rotating about a pole; standard plate tectonics) | plate motions, boundary types | `plates.py`, `sphere.py` |
| Parsons & Sclater 1977, JGR 82(5) (ocean depth ≈ 2500 + 350·√age m) | sea-floor depth from crust age | `elevation.py` |
| Ebert, Musgrave, Peachey, Perlin & Worley 1994, *Texturing and Modeling: A Procedural Approach* (value noise, fractal sums; ridged noise 1 − \|fBm\| after Musgrave's ridged multifractal) | procedural detail, old orogens, fractal coasts | `noise.py`, `crust.py`, `elevation.py`, `zones.py` |
| Daily-mean top-of-atmosphere insolation (standard astronomical formula); three-cell circulation (Hadley, Ferrel, polar); 6.5 °C/km lapse rate (ICAO standard atmosphere) | temperature, winds | `climate.py`, `check.py` |
| Stommel 1948, Trans. AGU 29(2) (westward intensification); Ekman 1905 (wind-driven transport) | surface currents, upwelling | `ocean.py` |
| Angot, Bruneau & Fabrie 1999, Numer. Math. 81 (Brinkman penalisation) | land as high-friction fluid in the current solver | `ocean.py` |
| Holdridge 1947, Science 105; Holdridge 1967, *Life Zone Ecology* (life zones, biotemperature, PET = 58.93 × biotemperature) | biomes, potential evapotranspiration | `climate.py`, `environment.py`, `render.py` |
| Pike 1964, J. Hydrology 2 (actual evapotranspiration from rain and PET) | runoff | `hydrology.py` |
| Barnes, Lehman & Mulla 2014, Computers & Geosciences 62 (priority-flood + ε) | depression filling, drainage | `graph.py`, `hydrology.py`, `erosion.py` |
| O'Callaghan & Mark 1984 (steepest-descent flow routing, D8), here on hexagons | receivers, flow accumulation | `graph.py` |
| Strahler 1957, Trans. AGU 38(6) (stream order) | river order | `hydrology.py`, `geo.py` |
| Braun & Willett 2013, Geomorphology 180 (implicit stream-power incision) | erosion | `erosion.py` |
| Marching squares (contouring; cf. Lorensen & Cline 1987) | coastline and lake outlines | `geo.py` |
| Equal Earth projection (Šavrič, Patterson & Jenny 2018); Mollweide 1805 | map projections | `projections.py` |
| Kerguelen Plateau (real sunken continental plateau) | inspiration for sunken plateaus | `plateaus.py` |