# Data license

The code in this repository (`mcgraph/`, `scripts/`, `tests/`, and the explorer page) is released under the MIT License; see `LICENSE`.

The data products are released under the Creative Commons Attribution 4.0 International License (CC BY 4.0), https://creativecommons.org/licenses/by/4.0/. This covers:

- `outputs/` (edge list, crater table, GraphML, pair evidence, summary and validation files)
- `explorer/data/` (the data behind the interactive explorer)
- `figures/`
- `validation/`

Copyright (c) 2026 Michael Phillips.

## Source data

The crater attributes in these products derive from the Robbins and Hynek (2012) Mars crater database (2020 release). Anyone who uses these products should also cite that database:

Robbins, S. J., and Hynek, B. M. (2012). A new global database of Mars impact craters ≥1 km: 1. Database creation, properties, and parameters. *Journal of Geophysical Research: Planets*, 117, E05004. https://doi.org/10.1029/2011JE003966

Host geologic units come from Tanaka, K. L., et al. (2014), Geologic map of Mars, U.S. Geological Survey Scientific Investigations Map 3292, https://doi.org/10.3133/sim3292. Topographic tests use the MGS MOLA MEGDR (Smith et al., 2003, NASA Planetary Data System).