We use Emissivity Normalization technique to
separate the emissivity and temperature
information in radiance data measured with
thermal infrared sensors. Emissivity Normalization
assume a fixed emissivity value and produce
emissivity and temperature outputs. It calculates
the temperature for every pixel and band in the
data using a fixed emissivity value. The highest
temperature for each pixel is used to calculate the
emissivity values using the Planck function.
IV Results and Discussions
The resulting surface temperatures for the two
scenes are presented in Figures. The mean
temperatures estimated for the whole study area
are 15.763 °C in Oct and 17.154 °C in Nov 2010.
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia
In both images, comparatively very small area
shows temperature less than -23(dark green and
Black) are the peaks, in accumulation area the
estimated temperature was around -5.00 ? C to -
23°C, where as in ablation area the temp was -
5.00°Cto 0° C. At snout the measured temperature is
0.199°C for both images. The remaining portion of
the study area shows temperature between 1°C to
32.72°C in Oct 1990 and 1°C to 42.04°C in Nov
2010.
Whole Study area covers Gangotri glacier as well as
Six Districts of Uttarakhand are Haridwar,
Dehradun, Uttarkashi, Rudraprayag, Tehri Garhwal
and Pauri and one District of Uttar Pradesh that is
Saharanpur. Table 3 shows the derived land surface
temperature of complete scenes.
Feature Coordnates Elevation Temp in 1990 Temp in 2001 Temp in 2010
Snout 30.92,79.07 4082 0.1999 0.1998 0.1999
ELA 30.82,79.12 4649 -5.910 -5.715 -5.408
Max Altitude 30.73.70.27 6351 -23.77 -22.81 -21.58
Table2. Feature wise Surface Temperature of Gangotri Glacier
Fig. 4 Pattern of Estimated Temperature 1990
Fig.5 Pattern of Estimated Temperature 2010
Internatic
Conclusior
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Reference
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