Počet záznamů: 1  

Improved Temperature and Emissivity Separation Algorithm for Multispectral and Hyperspectral Sensors

  1. 1.
    0468557 - ÚVGZ 2018 RIV US eng J - Článek v odborném periodiku
    Pivovarník, Marek - Khalsa, Siri Jodha Singh - Jiménez-Muñoz, J. C. - Zemek, František
    Improved Temperature and Emissivity Separation Algorithm for Multispectral and Hyperspectral Sensors.
    IEEE Transactions on Geoscience and Remote Sensing and IEEE Transactions on Geoscience Electronics. Roč. 55, č. 4 (2017), s. 1944-1953. ISSN 0196-2892. E-ISSN 1558-0644
    Grant CEP: GA MŠMT(CZ) LO1415; GA MZe(CZ) QJ1610289
    Výzkumná infrastruktura: CzeCOS II - 90061
    Institucionální podpora: RVO:67179843
    Klíčová slova: temperature sensors * hyperspectral sensors * land surface * brightness temperature * standards
    Obor OECD: Environmental sciences (social aspects to be 5.7)
    Impakt faktor: 4.662, rok: 2017

    The Temperature and Emissivity Separation (TES) algorithm was originally developed for the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). This paper focuses on improving the TES algorithm. The main modification is the replacement of the normalized emissivity module with a new module, which is based on the smoothing of spectral radiance signatures. Smoothing is performed by estimating emissivity using an optimized approximation of the relationship between brightness temperature and emissivity. The improved TES algorithm, which is called Optimized Smoothing for Temperature Emissivity Separation (OSTES), was first tested on simulated data from three different sensors, namely, ASTER, Airborne Hyperspectral Scanner, and Thermal Airborne Spectrographic Imager. Processing simulated data with OSTES shows that it produces more accurate and precise temperature and emissivity retrievals than TES for samples with low spectral contrast. These results also show that the OSTES is less sensitive to variations in atmosphere and sample temperatures. The OSTES performance was secondly tested and compared with ASTER standard products. Testing showed that the OSTES temperature retrievals agree with AST_08 (kinetic temperature) but the emissivity retrievals differ substantially from AST_05 (surface emissivity). This implies that the ASTER standard products, AST_08 and AST_05, are not consistent with each other. Emissivities that are derived using temperatures from AST_08 and ASTER thermal surface radiances from AST_09T perform similar or worse when compared with OSTES emissivities. Emissivities delivered by AST_05 also exhibit step discontinuities, whereas the OSTES emissivitites are smoother over homogeneous surfaces. However, all emissivity spectra are affected by imperfect atmospheric corrections.
    Trvalý link: http://hdl.handle.net/11104/0266371

     
     
Počet záznamů: 1  

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