Kamis, 22 Januari 2009

MODIS (Aqua/Terra)-Image Processing (2)

MODIS (Aqua/Terra)-Image Processing (2)

continues from previous entry...http://ajiputrap.blogspot.com/modis-image-processing.html

" temperature brightness " or " temperature brightness value "

Aqua MODIS image processing for sea surface temperature using two bands : band 31 and band 32 (that have processed for corrected radiance value).
We need to convert radiance value both bands (31 and 32) to Brightness Value using “Planck”:

Tb = c2/(Vi * ln (c1/(Vi5 * radiance) + 1))
where Tb = Brightness Value (K),
c1 = Constanta radiance (1.1910659x108 [W m -2sr-1 (µm-1 )-4 ])
c2 = Constanta radiance (1.438833 x 104 [K µm])
Vi = central wavelength

below are table for central wavelength - Aqua/Terra MODIS Bands..

For AQUA MODIS =
Band 20 : 3.7803
Band 22 : 3.9720
Band 23 : 4.0617
Band 31 : 11.0263
Band 32 : 12.0424

For TERRA MODIS =
Band 22 : 3.9719
Band 23 : 4.0567
Band 31 : 11.0073
Band 32 : 12.0020

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nice to share

Aji PP

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