MERIS Land Products Validation

摘要: Over land, the aerosol remote sensing is based on observation of Dense Dark Vegetation (DDV) and this concept applied MERIS with a spectral index (ARVI, Atmospherically Resistant Index) to detect DDV use bands at 412, 443 670 nm characterize aerosols. The size distribution assumed follow Junge law while refractive set 1.44. product consists optical thickness (AOT) 865 dependence path radiance (Epsilon coefficient e which ratio reflectance 765 that nm). validation exercise mostly ground measurements from AERONET network. A classical conducted using extinction measurements. deeper done in order investigate different assumptions used module by: (i) validate model. Atmospheric correction will be done, including aerosols, derive reflectances for comparison standard values. (ii) choice by comparing simulated radiances model principal plane. AOT badly retrieved because inaccuracy red whereas good agreement data accuracy comparable what achieved MODIS over sites. well adapted representation aerosols properties. main algorithm improvement we recommend introducing dynamical varies ARVI target. Under clear sky conditions, surface pressure level-2 two band between 761.75 753 nm. This first corrected coupling scattering absorption get oxygen transmittance TO2. TO2 pre computed versus air mass m time P simply look up tables. itself barometric collected ECMWF Digital Elevation Model attached product.