Detection of Forest Windstorm Damages with Multitemporal SAR Data-A Case Study : Finland

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http://hdl.handle.net/10138/327845

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Tomppo , E , Ronoud , G , Antropov , O , Hytonen , H & Praks , J 2021 , ' Detection of Forest Windstorm Damages with Multitemporal SAR Data-A Case Study : Finland ' , Remote Sensing , vol. 13 , no. 3 , 383 . https://doi.org/10.3390/rs13030383

Title: Detection of Forest Windstorm Damages with Multitemporal SAR Data-A Case Study : Finland
Author: Tomppo, Erkki; Ronoud, Ghasem; Antropov, Oleg; Hytonen, Harri; Praks, Jaan
Other contributor: University of Helsinki, Department of Forest Sciences
Date: 2021-02
Language: eng
Number of pages: 28
Belongs to series: Remote Sensing
ISSN: 2072-4292
DOI: https://doi.org/10.3390/rs13030383
URI: http://hdl.handle.net/10138/327845
Abstract: The purpose of this study was to develop methods to localize forest windstorm damages, assess their severity and estimate the total damaged area using space-borne SAR data. The development of the methods is the first step towards an operational system for near-real-time windstorm damage monitoring, with a latency of only a few days after the storm event in the best case. Windstorm detection using SAR data is not trivial, particularly at C-band. It can be expected that a large-area and severe windstorm damage may affect backscatter similar to clear cutting operation, that is, decrease the backscatter intensity, while a small area damage may increase the backscatter of the neighboring area, due to various scattering mechanisms. The remaining debris and temporal variation in the weather conditions and possible freeze-thaw transitions also affect observed backscatter changes. Three candidate windstorm detection methods were suggested, based on the improved k-nn method, multinomial logistic regression and support vector machine classification. The approaches use multitemporal ESA Sentinel-1 C-band SAR data and were evaluated in Southern Finland using wind damage data from the summer 2017, together with 27 Sentinel-1 scenes acquired in 2017 and other geo-referenced data. The stands correctly predicted severity category corresponded to 79% of the number of the stands in the validation data, and already 75% when only one Sentinel-1 scene after the damage was used. Thus, the damaged forests can potentially be localized with proposed tools within less than one week after the storm damage. In this study, the achieved latency was only two days. Our preliminary results also indicate that the damages can be localized even without separate training data.
Subject: boreal forest
windstorm damage
synthetic aperture radar
C-band
Sentinel-1
support vector machine
improved k-NN
genetic algorithm
multinomial logistic regression
SUPPORT VECTOR MACHINES
REMOTE-SENSING DATA
BACKSCATTER
CLASSIFICATION
VARIABLES
MISSION
BIOMASS
KERNEL
AREAS
1172 Environmental sciences
1171 Geosciences
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