Remote sensing of land surface temperature Lecture 8.

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Presentation transcript:

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 µm). Human being has normal 98.6 ºF (37 ºC)  Our eyes are only sensitive to visible energy ( 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 lectureanother lecture For 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 T b, which is less than the real physical (or surface) temperature T. h, Planck’s constant =6.626 x Ws 2 T, Kelvin (K) c, 3 x 10 8 m/s k, Boltzmann’s constant=1.38 x Ws/K L or B, radiance (Wm -2 μm -1 ) c1=2πhc 2 =3.74 x Wm 2 c2=ch/k= mK

MODIS land surface temperature and emissivity product led by Dr. Wan Wan et al. 2002

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

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

Dallas-Fort Worth Houston El Paso/Juarez San Antonio

10:30 am 1:30 pm San Antonio

10:30 pm 1:30 am San Antonio

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