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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: D.Verbyla@uaf.edu. 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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  1. Remote Sensing of Fire Severity in Interior Alaska(some of the time) Dave Verbyla Dept. of Forest Sciences, UAF Email: D.Verbyla@uaf.edu

  2. Field Estimates : CBI

  3. Remotely Sensed Index Field Estimate

  4. 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

  5. Saturation of Spectral Response?

  6. SWIR reflectance NIR reflectance

  7. dNBR = 672 dNBR = 797 dNBR = 913

  8. Fire Severity Trends 1980s Satellite Data 1990s Satellite Data 2000s Satellite Data

  9. NBR 4-Aug-2004 Sun Elevation: 36o Azimuth: 165o NBR 6-Sept-2004 Sun Elevation: 30o Azimuth: 166o

  10. 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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