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Remote Sensing of Wildfires - Why and How?
 

Remote Sensing of Wildfires - Why and How?

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A gentle introduction / 15 min talk given in August 2013 in front of a group of undergraduate interns at the Department for Geology and Geophysics, University of Alaska Fairbanks.

A gentle introduction / 15 min talk given in August 2013 in front of a group of undergraduate interns at the Department for Geology and Geophysics, University of Alaska Fairbanks.

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    Remote Sensing of Wildfires - Why and How? Remote Sensing of Wildfires - Why and How? Presentation Transcript

    • Remote Sensing of (Alaskan boreal) Wildfires (with Satellites) –  Why and How? Chris Waigl 2013-08-08, G&G Remote Sensing lunch seminar UAF
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 2 What’s special about Alaska (and the whole boreal zone)? Image:Alaska Climate Research Center
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 3 Why? Global (or regional) fire maps NASA MODIS Global Firemap - July 10-19, 2013
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 4 How is it spreading? Where does the smoke go? Steward Creek 2 fire 2013- Alaska Fire Service
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 5 How severe is it? How is it impacting the ecosystem? à Ecology Steward Creek 2 fire 2013- Image Alaska State Parks
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 6 How? Passive remote sensing from polar-orbiting satellites For example, MODIS !   36 bands: 20 reflective visible and short-wave infrared (250-500m resolution), 16 emissive mid and thermal IR1000m !   Up to 8 good images of Alaska / day Trade-off between resolution in time and space: http://www.youtube.com/watch?v=V0hsCD4qZMk
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 7 We measure the intensity of radiation emitted by the fire
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 8 Landsat (July 7, 2009)
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 9 Zooming in…
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 10 Time series: July 4-7, 2009, MODIS over Landsat
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 11 2004 Boundary Fire – MODIS Terra What’s in a pixel? •  shape •  overlap •  distortion 1 px = 1 x 1 km at nadir (= looking straight down)
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 2004 Boundary Fire – simultaneous ASTER image 12 1 px = 30 x 30 m
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 2004 Boundary Fire – sub-pixel fire temperature = temperature of the portion of the pixel that is actually on fire 13
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 Different method: Active remote sensing with microwaves (radar backscatter - SAR) 14 new burn old fire scar
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 Overlaying MODIS hotspot pixels on SAR 15
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 Different method: Thermal aerial imagery 16
    • Chris Waigl,– cwaigl@alaska.edu – Remote sensing of (boreal) wildfires (with satellites):Why and how? – 2013-08-08 Thanks! 17 Lime River fire 2013- Alaska Fire Service Data and imagery courtesy of: •  Alaska Fire Service/AICC •  U.S. Geological Survey •  NASA’s Earth-Sun System Division •  Martin Stuefer •  Alaska Climate Research Center •  Alaska Satellite Facility/SAR Data Center •  Alaska State Parks