Read-in landuse intensity data (tau) following the methodology published in
Dietrich J.P., Schmitz C., Mueller C., Fader M., Lotze-Campen H., Popp A.,
Measuring agricultural land-use intensity - A global analysis using a
model-assisted approach, Ecological Modelling, Volume 232, 10 May 2012,
Pages 109-118, ISSN 0304-3800, 10.1016/j.ecolmodel.2012.03.002.