• Monitoring visitors to natural areas in wintertime: issues in counter accuracy 

      Andersen, Oddgeir; Gundersen, Vegard; Wold, Line Camilla; Stange, Erik (Journal article; Peer reviewed, 2014)
      The sustainable management of vulnerable natural areas requires accurate measurement of visitor flows, especially in mountain and protected areas. Pyroelectric sensors that detect the heat radiation emitted by human bodies ...