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Remote Sens. 2013, 5(4), 1912-1931; doi:10.3390/rs5041912
Article

Early Detection of Bark Beetle Green Attack Using TerraSAR-X and RapidEye Data

1,* , 2
 and 1
Received: 18 February 2013; in revised form: 4 April 2013 / Accepted: 4 April 2013 / Published: 16 April 2013
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Abstract: Bark beetles cause widespread damages in the coniferous-dominated forests of central Europe and North America. In the future, areas affected by bark beetles may further increase due to climate change. However, the early detection of the bark beetle green attack can guide management decisions to prevent larger damages. For this reason, a field-based bark beetle monitoring program is currently implemented in Germany. The combination of remote sensing and field data may help minimizing the reaction time and reducing costs of monitoring programs covering large forested areas. In this case study, RapidEye and TerraSAR-X data were analyzed separately and in combination to detect bark beetle green attack. The remote sensing data were acquired in May 2009 for a study site in south-west Germany. In order to distinguish healthy areas and areas affected by bark beetle green attack, three statistical approaches were compared: generalized linear models (GLM), maximum entropy (ME) and random forest (RF). The spatial scale (minimum mapping unit) was 78.5 m2. TerraSAR-X data resulted in fair classification accuracy with a cross-validated Cohen’s Kappa Coefficient (kappa) of 0.23. RapidEye data resulted in moderate classification accuracy with a kappa of 0.51. The highest classification accuracy was obtained by combining the TerraSAR-X and RapidEye data, resulting in a kappa of 0.74. The accuracy of ME models was considerably higher than the accuracy of GLM and RF models.
Keywords: forest health; satellite images; supervised classification; maximum entropy; random forest; generalized linear models forest health; satellite images; supervised classification; maximum entropy; random forest; generalized linear models
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Ortiz, S.M.; Breidenbach, J.; Kändler, G. Early Detection of Bark Beetle Green Attack Using TerraSAR-X and RapidEye Data. Remote Sens. 2013, 5, 1912-1931.

AMA Style

Ortiz SM, Breidenbach J, Kändler G. Early Detection of Bark Beetle Green Attack Using TerraSAR-X and RapidEye Data. Remote Sensing. 2013; 5(4):1912-1931.

Chicago/Turabian Style

Ortiz, Sonia M.; Breidenbach, Johannes; Kändler, Gerald. 2013. "Early Detection of Bark Beetle Green Attack Using TerraSAR-X and RapidEye Data." Remote Sens. 5, no. 4: 1912-1931.


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