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

Remote Sensing

Dirk Hoekman¹  Martin Herold²  Sytze de Bruin²  Jan Verbesselt²  Johannes Reiche² 

[1] Earth System Science Group, Wageningen University, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands;Laboratory of Geo-Information Science and Remote Sensing, Wageningen University, Droevendaalsesteeg 3, 6708 PB Wageningen, The Netherlands;

关键词: near real-time;    deforestation;    Bayesian approach;    Landsat;    ALOS PALSAR;   

DOI  :  10.3390/rs70504973

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown