Remote sensing of land surface temperature
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Transcript of Remote sensing of land surface temperature
Remote sensing of land surface temperature
Lecture 8
Thermal infrared of EM spectrum
0.7 m
3.0 m
100 m
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.
Details about thermal remote sensing refers to another lectureFor this lecture and lab, we focus on MODIS LST processing and application
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.
)1(2),(
)1(2),( )/5
2
)/5
2
kThckThcb e
hcTBe
hcTLb
)1ln( / bTkhcekhcT
h, Planck’s constant =6.626 x 10-34 Ws2
T, Kelvin (K)c, 3 x 108 m/sk, 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
MODIS land surface temperature and emissivity product led by Dr. Wan
http://www.icess.ucsb.edu/modis/modis-lst.html
Wan et al. 2002
The accuracy of temperature is better than 1 K, Wan (2008)
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Xie and Ytuarte, 2005
Urban Heat Island of San Antonio downtown area detected by MODIS temperature product1:30 am, July 15, 2004
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Black areas are no date, due to cloud cover. So this image should not use
The Delaunay triangulation method is available under ENVI, at Topographic/Replace Bad Values
David Prado thesis, 2010
Source: Jeff Dozier
Active fire detection:MODIS fire and thermal anomalies products
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
http://modis-fire.gsfc.nasa.gov/index.asp