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Under sun-light illumination, the shape of the atmospheric oxygen bands (O2-B, 687 nm and O2-A, 760 nm) of the vegetation radiance is modified by chlorophyll fluorescence. However for far-range measurements, atmospheric effects also modify this shape. In this study, measurements in O2-A and O2-B absorption bands have been performed at different altitudes up to 3123 m over bare soil and wheat fields...
This study aims to quantify sensitivity of two atmospheric condition parameters: water vapour concentration (wv) and visibility in atmospheric correction processes in an operational processing chain. wv and visibility are important atmospheric condition parameters when retrieving surface reflectance from at-sensor radiance. To save cost, these parameters are often estimated using an image-based method...
This paper aims to solve the critical problem of uncertainty optimization of two atmospheric condition parameters: water vapor concentration (wv) and visibility. Both are used in atmospheric correction (AC) processes when retrieving surface reflectance from at-sensor radiance. Parameter uncertainty is often over or under estimated. A framework is proposed that determines the relation (indirect) of...
To promote cross-calibration or information extraction involving hyperspectral reflectance data from different sources, a method for restoring reflectance of a higher spectral resolution from hyperspectral radiance data is proposed. It involves three steps: spectral super-resolution of radiance data, transformation to the higher resolution of interest, and radiative-transfer-model-based atmospheric...
Processing long-wave infrared (LWIR) hyperspectral imagery to surface spectral emissivity or reflectance units via atmospheric compensation and temperature-emissivity separation (TES) affords the opportunity to remotely classify and identify surface materials with minimal interference from atmospheric effects. This paper describes an automated atmospheric compensation and TES method, called FLAASH-IR...
The correction of BRDF effects for airborne wide FOV imaging spectroscopy data is of interest for a consistent data processing and products generation. Recently, a new BRDF effects correction method (BREFCOR) has been implemented as additional processing step after the well-known atmospheric compensation workflow. This paper shows validation results of the method for sample data sets of HYSPEX, CASI,...
The Hyperspectral Imager for the Coastal Ocean (HICO) is an imaging spectrometer specifically designed to monitor the coastal ocean. The processing of Top-Of-Atmosphere (TOA) radiance data down to surface reflectance is fundamental for the retrieval of water quality products. However, the current HICO processing chain does not provide atmospheric corrected data nor higher-level water quality products...
A new fluorescence retrieval method is proposed to support ESA's 8th Earth Explorer Fluorescence EXplorer (FLEX) candidate mission. Most hyperspectral fluorescence retrieval algorithms available in the literature are very sensitive to true reflectance modelization and/or they assume the atmospheric status as known. The proposed algorithm delivers the retrieval of full fluorescence spectrum at canopy...
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