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Remote sensing of land surface temperature

Remote sensing of land surface temperature. Lecture 8 . Thermal infrared of EM spectrum . Details about thermal remote sensing refers to another lecture For this lecture and lab, we focus on MODIS LST processing and application.

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Remote sensing of land surface temperature

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  1. Remote sensing of land surface temperature Lecture 8

  2. Thermal infrared of EM spectrum Details about thermal remote sensing refers to another lecture For this lecture and lab, we focus on MODIS LST processing and application • All objects have a temperature above absolute zero (0 K) emit EM energy (in 3.0-100 µm). • Human being has normal 98.6 ºF (37 ºC) • Our eyes are only sensitive to visible energy (0.4-0.7 µm). Human sense thermal energy through touch. while detectors (sensors) are sensitive to all EM spectrum. • All objects (vegetation, soil, rock, water, concrete, etc) selectively absorb solar short-wavelength energy and radiate thermal infrared energy. 100 m 3.0 m 0.7 m

  3. Brightness temperature, and physical (surface) temperature • Through radiance recorded by a remote sensor, if we use the Planck equation, we can get a temperature, which we call brightness temperature Tb, which is less than the real physical (or surface) temperature T. h, Planck’s constant =6.626 x 10-34 Ws2 T, Kelvin (K) c, 3 x 108 m/s k, Boltzmann’s constant=1.38 x 10-23 Ws/K L or B, radiance (Wm-2μm-1) c1=2πhc2=3.74 x 10-16 Wm2 c2=ch/k=0.0144 mK

  4. MODIS land surface temperature and emissivity product led by Dr. Wan http://www.icess.ucsb.edu/modis/modis-lst.html Wan et al. 2002

  5. The accuracy of temperature is better than 1 K, Wan (2008)

  6. Urban Heat Island of San Antonio downtown area detected by MODIS temperature product 1:30 am, July 15, 2004 Xie and Ytuarte, 2005

  7. Houston Dallas-Fort Worth El Paso/Juarez San Antonio

  8. 10:30 am 1:30 pm 2000-2008 San Antonio 2002-2008

  9. 10:30 pm 1:30 am 2000-2008 San Antonio 2002-2008

  10. Black areas are no date, due to cloud cover. So this image should not use

  11. The Delaunay triangulation method is available under ENVI, at Topographic/Replace Bad Values

  12. David Prado thesis, 2010

  13. Source: Jeff Dozier

  14. Active fire detection:MODIS fire and thermal anomalies products http://modis-fire.gsfc.nasa.gov/index.asp Image caption: Fires in the Bahamas, Florida and Cuba (03 April 2004, 18:30 UTC) identified using MODIS Aqua and outlined in red on the MODIS 1km corrected reflectance product

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