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Remote Sens. 2014, 6(9), 8878-8903; doi:10.3390/rs6098878

Annual Detection of Forest Cover Loss Using Time Series Satellite Measurements of Percent Tree Cover

Global Land Cover Facility, Department of Geographical Sciences, University of Maryland, College Park, MD 20742, USA
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Received: 10 June 2014 / Revised: 3 September 2014 / Accepted: 10 September 2014 / Published: 19 September 2014
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Abstract

We introduce and test a new method to detect annual forest cover loss from time series estimates of percent tree cover. Our approach is founded on two realistic assumptions: (1) land cover disturbances are rare events over large geographic areas that occur within a short time frame; and (2) spatially discrete land cover disturbances are continuous processes over time. Applying statistically rigorous algorithms, we first detect disturbance pixels as outliers of an underlying chi-square distribution. Then, we fit nonlinear, logistic curves for each identified change pixel to simultaneously characterize the magnitude and timing of the disturbance. Our method is applied using the yearly Vegetation Continuous Fields (VCF) tree cover product from Moderate Resolution Imaging Spectroradiometer (MODIS), and the resulting disturbance-year estimates are evaluated using a large sample of Landsat-based forest disturbance data. Temporal accuracy is ~65% at 250-m, annual resolution and increases to >85% when temporal resolution is relaxed to ±1 yr. The r2 of MODIS VCF-based disturbance rates against Landsat ranges from 0.7 to 0.9 at 5-km spatial resolution. The general approach developed in this study can be potentially applied at a global scale and to other land cover types characterized as continuous variables from satellite data. View Full-Text
Keywords: MODIS; Landsat; time series; Vegetation Continuous Fields; change detection; forest; land cover MODIS; Landsat; time series; Vegetation Continuous Fields; change detection; forest; land cover
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Song, X.-P.; Huang, C.; Sexton, J.O.; Channan, S.; Townshend, J.R. Annual Detection of Forest Cover Loss Using Time Series Satellite Measurements of Percent Tree Cover. Remote Sens. 2014, 6, 8878-8903.

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