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MODIS consists of a cross-track, two-sided scan mirror, whose reflectance is not uniform but is a function of angle of incidence (AOI). This feature, known as response versusscan-angle (RVS), was characterized for all reflective solar bands of both MODIS instruments prior to launch. The RVS characteristic has changed on orbit, which must be tracked precisely over time to ensure the quality of MODIS products. The MODIS characterization support team utilizes the onboard calibrators and the earth view responses from multiple pseudo invariant desert sites to track the RVS changes at different AOIs. The drawback of using deserts is the assumption that these sites are radiometrically stable during the monitoring period. In addition, the 16-day orbit repeat cycle of MODIS allows for only a limited set of AOIs over a given desert. We propose a novel and robust approach of characterizing the MODIS RVS using tropical deep convective clouds (DCC). The method tracks the monthly DCC response at specified sets of AOIs to compute the temporal RVS changes. Initial results have shown that the Aqua-MODIS collection 6 band 1 level 1B radiances show considerable residual RVS dependencies, with long-term drifts up to 2.3 at certain AOIs.

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NASA Technical Reports Server (NTRS)  

Autor(es)

Gopalan, Arun -  Scarino, Benjamin -  Xiong, Xiaoxiong -  Doelling, David R. -  Angal, Amit -  Wu, Aisheng -  Bhatt, Rajendra -  Haney, Conor - 

Id.: 69714106

Versión: 1.0

Estado: Final

Tipo:  text - 

Palabras claveEarth Resources and Remote Sensing - 

Cobertura:  Unclassified, Unlimited, Publicly available - 

Tipo de recurso: GSFC-E-DAA-TN39130  -  Journal of Applied Remote Sensing (ISSN 1931-3195); Volume 11; Issue 1; 016014  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: Copyright

Formatos:  text - 

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Other Sources

Fecha de contribución: 12-mar-2017

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