Aarhus University Seal / Aarhus Universitets segl

Disturbance mapping in arctic tundra improved by a planning workflow for drone studies: Advancing tools for future ecosystem monitoring

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

DOI

  • Isabell Eischeid, UiT The Arctic University of Norway, Norwegian Polar Institute, Aarhus University
  • ,
  • Eeva M. Soininen, UiT The Arctic University of Norway
  • ,
  • Jakob J. Assmann
  • Rolf A. Ims, UiT The Arctic University of Norway
  • ,
  • Jesper Madsen
  • Åshild Pedersen, Norwegian Polar Institute
  • ,
  • Francesco Pirotti, University of Padova
  • ,
  • Nigel G. Yoccoz, UiT The Arctic University of Norway
  • ,
  • Virve T. Ravolainen, Norwegian Polar Institute

The Arctic is under great pressure due to climate change. Drones are increasingly used as a tool in ecology and may be especially valuable in rapidly changing and remote landscapes, as can be found in the Arctic. For effective applications of drones, decisions of both ecological and technical character are needed. Here, we provide our method planning workflow for generating ground-cover maps with drones for ecological monitoring purposes. The workflow includes the selection of variables, layer resolutions, ground-cover classes and the development and validation of models. We implemented this workflow in a case study of the Arctic tundra to develop vegetation maps, including disturbed vegetation, at three study sites in Svalbard. For each site, we generated a high-resolution map of tundra vegetation using supervised random forest (RF) classifiers based on four spectral bands, the normalized difference vegetation index (NDVI) and three types of terrain variables—all derived from drone imagery. Our classifiers distinguished up to 15 different ground-cover classes, including two classes that identify vegetation state changes due to disturbance caused by herbivory (i.e., goose grubbing) and winter damage (i.e., ‘rain-on-snow’ and thaw-freeze). Areas classified as goose grubbing or winter damage had lower NDVI values than their undisturbed counterparts. The predictive ability of site-specific RF models was good (macro-F1 scores between 83% and 85%), but the area of the grubbing class was overestimated in parts of the moss tundra. A direct transfer of the models between study sites was not possible (macro-F1 scores under 50%). We show that drone image analysis can be an asset for studying future vegetation state changes on local scales in Arctic tundra ecosystems and encourage ecologists to use our tailored workflow to integrate drone mapping into long-term monitoring programs.

Original languageEnglish
Article number4466
JournalRemote Sensing
Volume13
Issue21
Number of pages25
ISSN2072-4292
DOIs
Publication statusPublished - Nov 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

    Research areas

  • Classifier, Disturbance, Drone, Ecological monitoring, GLCM, Grubbing, Herbivore, Random forest, Svalbard, Winter climate effect

See relations at Aarhus University Citationformats

ID: 226837617