Skip to main content

Goal: Apply Knowledge Globally Monitoring forest health during a pandemic: Satellite-based remote sensing fills a crucial gap

A map showing tornado damage, denoted by purple and red coloring, across a porion of Mississippi
This high resolution map of tornado damage in Mississippi was produced days after the storm event and successfully communicated where trees were damaged. Read more about the April 2020 MS Tornadoes project at the HiForm website. (Map image by Steve Norman and Bill Christie)


Remote sensing technologies that monitor forest disturbances have taken a giant leap forward just when they’re needed the most—during the COVID-19 pandemic.


Assessing damage from natural disturbances is an ongoing need for state and federal forest managers. Before the 2020 growing season began in the South, tornadoes struck from Texas to North Carolina. Two sequential frosts set back the growing season across Tennessee, Kentucky, and Virginia. As the summer went on, vast sections of Michigan and New York were defoliated by the nonnative gypsy moth, then hurricanes inundated low lying areas of the South.

For decades, the USDA Forest Service and state agencies have tracked disturbances such as these in partnership, primarily through aircraft and ground observations. Those capabilities were curtailed in 2020 by coronavirus restrictions. The forest monitoring mission would need to rely on existing and new remote sensing technologies during the pandemic.

Southern Research Station researchers stepped up to this challenge by working closely with state and federal partners to ensure maximum use of existing ForWarn products and the new HiForm workflow that makes use of high-resolution satellite imagery. Researchers worked closely with partners to map damage and build capacity through free sharing of analysis tools and one-on-one exchange. This communication helped managers track disturbances and provided additional insights for the researchers. Given the long-term cost savings and safety benefits of rapidly evolving remote sensing technologies, this intense 2020 team effort should continue to reap rewards for years to come.

Principal Investigators
Steve Norman, Research Ecologist
Bill Christie, Biological Scientist
William Hargrove, Research Ecologist
4854 - Eastern Forest Environmental Threat Assessment Center
Strategic Program Area
Inventory and Monitoring
CompassLive Article
Satellite Mapping of Forest Disturbances Can Help When Field Efforts Are Restricted
Research Partners
USDA Forest Service National Forest System, Southern Region
Forest Health Protection
Forest Service Remote Sensing Applications Center (GTAC)
External Partners
Mississippi Forestry Commission
Texas A&M Forest Service
North Carolina Forest Service
Arkansas Department of Agriculture Forestry Division
Tennessee Division of Forestry
Georgia Forestry Commission