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PerOla

Per-Ola Olsson

Researcher

PerOla

Exploring the potential to use in-between pixel variability for early detection of bark beetle attacked trees

Author

  • Per-Ola Olsson
  • Hugo Bergman
  • Karl Piltz

Editor

  • Peter van Oosterom
  • Hendrik Ploeger
  • Ali Mansourian
  • Simon Scheider
  • Rob Lemmens
  • Bastiaan van Loenen

Summary, in English

The European spruce bark beetle (Ips typographus L.) is a major disturbance agent in Norway spruce (Picea abies (L.) Karst) forests in Europe and it is estimated that a changing climate will result in more severe outbreaks in the future. To reduce the risk of large outbreaks it is important to have methods that enable early detection of bark beetle attacks to help forest managers to prevent population build-up, e.g by sanitary cutting. Several studies have been devoted to early detection of bark beetle attacks with Sentinel-2 data with a focus on spectral properties and vegetation indices for early detection with pixel-based methods. In this study we explore the potential to use changes in variability between pixels in windows of different sizes (3×3, 4×4 and 5×5 pixels). We compute the coefficient of variation for four vegetation indices (NDVI, NDWI, CCI and NDRS) in a time-series of Sentinel-2 data during a bark beetle outbreak in Sweden that was triggered by a drought in 2018. The results indicate that CCI is the most promising index for early detection and that the variability between pixels increase in windows with attacked trees from late July when the main swarming was the second week of May.

Department/s

  • Dept of Physical Geography and Ecosystem Science
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publishing year

2023-06-06

Language

English

Publication/Series

AGILE GIScience Series

Volume

4

Issue

1

Document type

Conference paper

Topic

  • Physical Geography

Keywords

  • bark beetle
  • early detection
  • in-between pixel variability
  • Sentinel-2

Conference name

26th AGILE Conference on Geographic Information Science

Conference date

2023-06-13 - 2023-06-16

Conference place

Delft, Netherlands

Status

Published