Remote sensing of fire severity in interior alaska some of the time
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Remote Sensing of Fire Severity in Interior Alaska (some of the time). Dave Verbyla Dept. of Forest Sciences, UAF Email: [email protected] Field Estimates : CBI. Remotely Sensed Index. Field Estimate. Yukon Charley 1999 Fire start mid-June NBR 9-Sept CBI-NBR trend:

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Remote Sensing of Fire Severity in Interior Alaska (some of the time)

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Remote sensing of fire severity in interior alaska some of the time

Remote Sensing of Fire Severity in Interior Alaska(some of the time)

Dave Verbyla

Dept. of Forest Sciences, UAF

Email: [email protected]


Field estimates cbi

Field Estimates : CBI


Remote sensing of fire severity in interior alaska some of the time

Remotely

Sensed

Index

Field Estimate


2 upland black spruce burns

Yukon Charley 1999

Fire start mid-June

NBR 9-Sept

CBI-NBR trend:

R2 = 0.81, n=32

R2 = 0.64, n=47

Boundary 2004

Fire start mid-June

NBR 6-Sept

CBI-NBR trend:

R2 = 0.30, n=32

R2 = 0.43, n=28

R2 = 0.29, n=73

2 Upland Black Spruce Burns


Saturation of spectral response

Saturation of Spectral Response?


Remote sensing of fire severity in interior alaska some of the time

SWIR

reflectance

NIR reflectance


Remote sensing of fire severity in interior alaska some of the time

dNBR = 672

dNBR = 797

dNBR = 913


Fire severity trends

Fire Severity Trends

1980s Satellite Data

1990s Satellite Data

2000s Satellite Data


Remote sensing of fire severity in interior alaska some of the time

NBR

4-Aug-2004

Sun Elevation: 36o

Azimuth: 165o

NBR

6-Sept-2004

Sun Elevation: 30o

Azimuth: 166o


Summary

Summary

  • Remote sensing estimates best across wide range of severity

  • Unreliable to estimate fire severity among burns or across time

  • Underestimate fire severity in valley bottoms, N-facing slopes

  • Estimates should be calibrated by vegetation type


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