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) PowerPoint PPT Presentation


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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)

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:

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?


SWIR

reflectance

NIR reflectance


dNBR = 672

dNBR = 797

dNBR = 913


Fire Severity Trends

1980s Satellite Data

1990s Satellite Data

2000s Satellite Data


NBR

4-Aug-2004

Sun Elevation: 36o

Azimuth: 165o

NBR

6-Sept-2004

Sun Elevation: 30o

Azimuth: 166o


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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