About the Authors
Naturalis Biodiversity Center, Leiden, The Netherlands
University of Twente, Faculty of Geo-Information Science and Earth Observation – ITC, Enschede, The Netherlands
The authors have declared that no competing interests exist.
Conceived and designed the experiments: BW WB JWA AKS AGT NR. Performed the experiments: BW WB. Analyzed the data: BW WB. Wrote the paper: BW.