# Citation — Petrel Karst & Depressions Layer v0.1

## Cite this layer

> Petrel (2026). *Petrel Karst & Depressions Layer v0.1* [Data set].
> Global closed-depression depth and bedrock solubility at 90 m.
> https://petreldata.io/layers/karst-depressions

## Cite the sources it derives from

Depression depth is derived from GEDTM30 and the fill algorithm of Wang & Liu;
solubility is derived from GLiM. Cite them alongside this layer:

> Hartmann, J. & Moosdorf, N. (2012). The new global lithological map database
> GLiM. *Geochemistry, Geophysics, Geosystems* 13(12). PANGAEA.

> Wang, L. & Liu, H. (2006). An efficient method for identifying and filling
> surface depressions in digital elevation models. *International Journal of
> Geographical Information Science* 20(2), 193-213.

> OpenGeoHub (2025). GEDTM30: global ensemble digital terrain model at 30 m.
> Zenodo / PeerJ.

> Wessel, P. & Smith, W. H. F. (1996). A global, self-consistent, hierarchical,
> high-resolution shoreline database. *Journal of Geophysical Research* 101(B4),
> 8741-8743.

## Cite the validation source

The performance figures rest on the Florida Geological Survey's inventory, and
their terms require credit:

> Florida Department of Environmental Protection, Florida Geological Survey.
> *Florida Subsidence Incident Reports (SIRS)* [Data set].
> https://floridadep.gov/fgs/sinkholes/content/subsidence-incident-reports

DEP/FGS collected and maintain these records; they did not produce this layer
and do not endorse it.

## If you quote the performance figure

Quote it with its interval and its scope: **AUC 0.649 [0.58, 0.71], validated
in Florida only, against 103 verified sinkholes and 108 confirmed
non-sinkholes**. It is not a global validation, and the point estimate alone
overstates what 211 labelled points can support. See validation_report.md.