
ASTER: Advanced Spaceborne Thermal Emission and Reflection Radiometer
Like the sun, Earth also emits energy -- but this energy cannot be seen. Instead, it can be felt as heat because it is emitted in the thermal infrared range.
The emissivity of most natural Earth surfaces is a unitless quantity, and surfaces with emissivities less than 0.85 are typically restricted to deserts and semi-arid areas. Vegetation, water and ice have high emissivities, above 0.95 in the thermal infrared wavelength range.
NASA Jet Propulsion Laboratory (JPL) and California Institute of Technology has developed the ASTER GED product, which provides 11 layer data cubes with 100m GSD.
If you're looking for thermal emissivity data spanning the full globe, this is your resource. You can access the data here: asterweb.jpl.nasa.gov/data.asp


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