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Recent Efforts to Improve the Near Real Time Forest Disturbance Monitoring Capabilities of the ForWarn SystemThis presentation discusses the development of anew method for computing NDVI temporal composites from near real time eMODIS data This research is being conducted to improve forest change products used in the ForWarn system for monitoring regional forest disturbances in the United States. ForWarn provides nation-wide NDVI-based forest disturbance detection products that are refreshed every 8 days. Current eMODIS and historical MOD13 24 day NDVI data are used to compute the disturbance detection products. The eMODIS 24 day NDVI data re-aggregated from 7 day NDVI products. The 24 day eMODIS NDVIs are generally cloud free, but do not necessarily use the freshest quality data. To shorten the disturbance detection time, a method has been developed that performs adaptive length/maximum value compositing of eMODIS NDVI, along with cloud and shadow "noise" mitigation. Tests indicate that this method can reduce detection rates by 8-16 days for known recent disturbance events, depending on the cloud frequencies and disturbance type. The noise mitigation in these tests, though imperfect, helped to improve quality of the resulting NDVI and forest change products.
Document ID
20130003517
Acquisition Source
Stennis Space Center
Document Type
Conference Paper
Authors
Spruce, Joseph
(NASA Stennis Space Center Stennis Space Center, MS, United States)
Hargrove, William
(Department of Agriculture United States)
Gasser, Gerald
(Lockheed Engineering and Sciences Co. Bay Saint Louis, MS, United States)
Date Acquired
August 27, 2013
Publication Date
January 7, 2013
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
SSTI 2220-0245
Meeting Information
Meeting: U.S. Regional Association of the International Association for Landscape Ecology (US-IALE) 2013 Annual Symposium
Location: Austin, TX
Country: United States
Start Date: April 14, 2013
End Date: April 18, 2013
Funding Number(s)
CONTRACT_GRANT: NNS10AA35C
OTHER: USFS3PCC00
CONTRACT_GRANT: NNS04AB54T
OTHER: C04843.01372
Distribution Limits
Public
Copyright
Other

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