1. Department of Biological and Environmental Science, Long Island University, Brookville, NY, USA
2. U.S. National Parks Service (Ret.), Harpers Ferry, WV, USA
3. Faculty of Information Technology, Monash University, Melbourne, Australia
4. somethingaboutmaps, Madison, WI, USA
5. Esri Inc., Redlands, CA, USA
6. National Geographic Society, Washington, DC, USA