Abstract:
The ASTER On-Demand Level-2 Surface Temperature product uses the 5 thermal
infrared (TIR) Bands (acquired day or night) between the 8 and 12 micrometers
spectral range to provide surface temperatures at a 90 meter spatial resolution
for land areas only. Surface Kinetic Temperature provides a vital input to
... studies of volcanism, thermal inertia, surface energy, and high-resolution
mapping of fires. The ASTER On-Demand Level-2 Surface Temperature product uses
the same algorithm as the Surface Emissivity product. The surface kinetic
temperature is determined by applying Planck's Law using the emissivity values
from the Temperature-Emissivity Separation (TES) algorithm, which uses
atmospherically corrected ASTER Surface Radiance TIR data. The TES algorithm
first estimates emissivities in the TIR channels using the Normalized
Emissivity Method (NEM). These estimates are used along with Kirchoff's Law to
account for the land-leaving TIR radiance that is due to sky irradiance. That
figure is subtracted from TIR radiance iteratively to estimate the emitted
radiance from which temperature is calculated using the NEM module.
Data Set Characteristics:
Area: ~60 km x 60 km
Image Dimensions: 700 rows x 830 columns
File Size: ~3.5 Megabytes
Units: (?K) (T multiplied by 0.1)
Projection: Universal Transverse Mercator (UTM)
Data Format: HDF-EOS
Vgroup Data Fields: 1 
