Quantification of Forest Disturbance Intensity Using Time Series Landsat Observations and Field Inventory Data Chengquan Huang 1 , Xin Tao 1 , Feng Aron Zhao 1 , Karen Schleeweis 2 , Jeff Masek 3 , Samuel Goward 1 , and Jennifer Dungan 4 1 Department of Geographical Sciences, University of Maryland, 2 US Forest Service, Rocky Mountain Research Station, 3 NASA Goddard Space Flight Center, 4 NASA Ames Research Center May 30, 2018 Land Cover/Land Use Changes (LC/LUC) and Impacts on Environment in South/Southeast Asia - International Regional Science Meeting, 28-30th May, 2018, Philippines
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Quantification of Forest Disturbance Intensity Using Time ... · 30/05/2018 · 18 1984 1989 1994 1999 2004 Year FI 1989. 1990. 1992. 1994. 1996. 1998 + + + + + + 𝐹𝐹𝐹𝐹=
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Quantification of Forest Disturbance Intensity Using Time Series Landsat Observations
and Field Inventory DataChengquan Huang1, Xin Tao1, Feng Aron Zhao1, Karen Schleeweis2, Jeff
Masek3, Samuel Goward1, and Jennifer Dungan4
1 Department of Geographical Sciences, University of Maryland, 2 US Forest Service, Rocky Mountain Research Station, 3 NASA Goddard Space Flight
Center, 4 NASA Ames Research Center
May 30, 2018
Land Cover/Land Use Changes (LC/LUC) and Impacts on Environment in South/Southeast Asia -International Regional Science Meeting, 28-30th May, 2018, Philippines
Impacts of Forest Disturbances Are Broad• Climate change and Earth system processes
• Energy balance • Greenhouse gas emission• Surface roughness and albedo
• Biogeochemical and hydrological processes
• Environment, biodiversity and human well being
• Soil erosion• Habitat loss• Timber and other forestry resources
• Impacts depend on disturbance intensity• Disturbance detection and characterization
important
Fire Harvest Storm Insect
Multi-Decade Disturbance Records By Satellites
SE Asia Good time series since 1980s• 200+ Landsat 4-5 images
from 1987 to 1999 for Manila area
1987-12-30 1991-07-02
Landsat record of Mt. Pinatubo eruption
Free Data Policy
Sentinel 2Sentinel 1
And more ……
Forest Monitoring Using Annual Time Series
Landsat Time Series Stack (LTSS)
Tracking Forest Disturbance Using LTSS –Vegetation Change Tracker (VCT)
1989 19981996199419921990
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1984 1989 1994 1999 2004
Year
FI
Year of disturbance
𝐹𝐹𝐹𝐹 =𝑏𝑏 − �𝑏𝑏𝑓𝑓𝑆𝑆𝐷𝐷𝑓𝑓
Persisting nonforestPersisting forest Water
2002200320042005
Pre-198519851986198719881989
199019911992199319941995
199619971998199920002001
No-change Classes
Disturbance Year Classes
Disturbance Year Map
Available from: https://daac.ornl.gov/NACP/guides/NAFD-NEX_Forest_Disturbance.html(Goward, Huang, et al. 2015; Zhao, Huang, et al. 2017)
Forthcoming
US and Canada, 30 years (1986-2015)
Annual Forest Disturbance Record for US and Canada