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Joint VSWIR-TIR retrievals of earth's surface and atmosphere
- Source :
- Remote Sensing of Environment. 267:112727
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Remote spectroscopy of terrestrial ecosystems generally falls into one of two categories: UV, Visible and ShortWave InfraRed (VSWIR) methods measuring reflected solar illumination, and Thermal InfraRed (TIR) methods measuring radiation emitted from the Earth's surface. Both interpret the measured radiance with inversion algorithms that estimate surface reflectance, emissivity, surface temperatures, and the atmospheric state. However, the two regimes have traditionally used independent inversion methods. Here we present the first simultaneous inversion of the upwelling radiance spectrum from the UV through the VSWIR and the Thermal Infrared. Maximum A Posteriori estimation determines the surface and atmosphere state that is most consistent with measured radiance across the entire range. We find that the complementary information in the two intervals improves estimates of atmospheric properties, surface emissivity, and surface temperature. Posterior uncertainty is 40% lower in surface temperature and 60% in air temperature. Spurious correlations between atmospheric and surface state are also reduced, with 90% lower correlated uncertainty between total column water vapor and both surface and air temperature. Temperature-emissivity separation also improves, with a 33% reduction in correlated posterior uncertainty between the parameters. We demonstrate the method on coincident data from the Classic Airborne Visible Infrared Imaging Spectrometer (AVIRIS-C) operating in the VSWIR range, and the Hyperspectral Thermal Emission Spectrometer (HyTES) in the TIR range, during flights on NASA's high-altitude ER-2 aircraft. Measurements spanning 0.4 to 12 microns can improve estimates of surface and atmospheric properties, significantly advancing studies in terrestrial ecosystems, geology, agriculture, and urban management.
- Subjects :
- Thermal Emission Spectrometer
Soil Science
Hyperspectral imaging
Geology
Atmosphere
Airborne visible/infrared imaging spectrometer
Radiance
Emissivity
Astrophysics::Earth and Planetary Astrophysics
Computers in Earth Sciences
Spectroscopy
Physics::Atmospheric and Oceanic Physics
Water vapor
Remote sensing
Subjects
Details
- ISSN :
- 00344257
- Volume :
- 267
- Database :
- OpenAIRE
- Journal :
- Remote Sensing of Environment
- Accession number :
- edsair.doi...........645132efbd6c71c9258db5bdf13d5d9e