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U.S. Department of the Interior
U.S. Geological Survey
An Overview of the Composite Burn
Index (CBI) and the Feat/Firemon
Integrated (FFI) Database An Overview of the Monitoring Trends in Burn Severity (MTBS) Project and
Field-Based Burn Severity Assessment 02/06/2013
Josh Picotte [email protected]
ASRC Research and Technology Solutions (ARTS), contractor to the U.S. Geological Survey (USGS), Earth Resources Observation and Science (EROS) Center. Worked performed under USGS contract G08PC91508
Presentation Overview
Burn Severity
Composite Burn Index
Overview
CBI Example
Managing CBI data
within FFI
MTBS Data Validation Ron Masters 2009
Definition of Burn Severity
Nate Benson
Burn Severity at a Landscape Level
+
Forest
Site
Years or Growing Seasons -10 0 1 10 20 30
Char, Scorch
Consumption
Survivorship
Mortality
Species
Composition
Colonizers
Productivity
etc.
Understory
Soil, litter, Duff, Fuels,
Herbs, Shrubs
Overstory
Big Trees
Mid-Trees
Response
Green Biomass
Short-Term Severity
(First-Order Effects)
Long-Term Severity
Aggregate of Many
Responses - Over Area,
Strata and Components
Carl Key
Time Since Fire
<1 Month 12 Month
Carl Key
CBI-Forensic Ecology
Carl Key
CBI-Spatial Resolution
Plot level
Carl Key
30 meter dNBR 0.3 to 1 meter
CBI-Components
Burn Index: 0-3
0-Unburned
3-Severe Burn
Five Strata
4-5 Ratings Factors
Ryan and Noste 1985
Landsat
Averaged
Litter/Light Fuels
Duff
Medium Fuels
Heavy Fuels
Soil Cover/Color
% Foliage Altered
% Living/Resprouting
Colonizers
Species Composition
% Foliage Altered
% Green (Unaltered)
% Living/Resprouting
Species Composition
CBI Example-Understory Strata Substrates Score
2.7
2.6
2.3
n/r
2.9
n/r
2.0
2.2
2.7
2.8
2.8
1.0
2.0
Average:
2.6
Average:
2.3
Average:
2.2
Herbs/Low Shrubs
Tall Shrubs/Saplings
Nate Benson
% Green (Unaltered)
% Black (Torch)
% Brown (Scorch/Girdle)
% Canopy Mortality
Char Height
% Green (Unaltered)
% Black (Torch)
% Brown (Scorch/Girdle)
% Canopy Mortality
Char Height
Intermediate
Trees/Subcanopy Score
CBI Example-Overstory Strata
2.4
1.0
2.0
2.0
1.9
2.3
0.0
2.0
2.0
2.4
Average:
1.9
Average:
1.7
Big Trees/Upper Canopy
Nate Benson
CBI Example-Average CBI Score
Overall Average:
2.1
Overstory Average:
1.8
Understory Average:
2.4
Nate Benson
CBI-Site Selection
x
x
x
x
x
x x
x
x
x
x
x
x
Proposed Plots (X)
Added Plots (X)
Carl Key
Carl Key
Keep in mind..
Time affects observation
1st post-fire growing season
Numeric ratings
Averages spatial variation
Fire effects weighted equally
Observer bias
Experience improves accuracy
CBI is not a perfect measure
FFI Database-Website
http://frames.nbii.gov/portal/server.pt?open=512&objID=483&mode=2&in_hi_userid=2&cached=true0
FFI Database-Manuals and Download
FFI Database-Demo
659 - 1300 High
439 - 659 Moderate-High
269 - 439 Low-Moderate
99 - 269 Low
-100 - 99 Unburned
dNBR Severity
Burn Severity Comparison
30m
30m
30m
CBI versus dNBR-Thresholding
