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Innovative Technologies for Terrestrial Remote Sensing
Open AccessArticle

A Bayesian Approach to Combine Landsat and ALOS PALSAR Time Series for Near Real-Time Deforestation Detection

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Laboratory of Geo-Information Science and Remote Sensing, Wageningen University, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands
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Earth System Science Group, Wageningen University, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands
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Author to whom correspondence should be addressed.
Academic Editors: Josef Kellndorfer and Prasad S. Thenkabail
Remote Sens. 2015, 7(5), 4973-4996; https://doi.org/10.3390/rs70504973
Received: 17 March 2015 / Revised: 10 April 2015 / Accepted: 14 April 2015 / Published: 23 April 2015
To address the need for timely information on newly deforested areas at medium resolution scale, we introduce a Bayesian approach to combine SAR and optical time series for near real-time deforestation detection. Once a new image of either of the input time series is available, the conditional probability of deforestation is computed using Bayesian updating, and deforestation events are indicated. Future observations are used to update the conditional probability of deforestation and, thus, to confirm or reject an indicated deforestation event. A proof of concept was demonstrated using Landsat NDVI and ALOS PALSAR time series acquired at an evergreen forest plantation in Fiji. We emulated a near real-time scenario and assessed the deforestation detection accuracies using three-monthly reference data covering the entire study site. Spatial and temporal accuracies for the fused Landsat-PALSAR case (overall accuracy = 87.4%; mean time lag of detected deforestation = 1.3 months) were consistently higher than those of the Landsat- and PALSAR-only cases. The improvement maintained even for increasing missing data in the Landsat time series. View Full-Text
Keywords: near real-time; deforestation; Bayesian approach; Landsat; ALOS PALSAR near real-time; deforestation; Bayesian approach; Landsat; ALOS PALSAR
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Reiche, J.; De Bruin, S.; Hoekman, D.; Verbesselt, J.; Herold, M. A Bayesian Approach to Combine Landsat and ALOS PALSAR Time Series for Near Real-Time Deforestation Detection. Remote Sens. 2015, 7, 4973-4996.

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