Method to derive peat extent here: Gatis, N., Luscombe, D.J., Carless, D., Parry, Lauren, E., 
Fyfe, R.M., Harrod, T.R., Brazier, R.E., Anderson, K., 2019. Mapping upland peat depth using 
airborne radiometric and LiDAR survey data. Geoderma 335, 78–87. 
https://doi.org/doi.org/10.1016/j.geoderma.2018.07.041

