Impacts of hyperspectral sensor spectral coverage, sampling and resolution on cross-comparison with broadband sensor for reflective solar bands

Abstract

Science and Exploration Directorate, NASA/GSFC, Greenbelt, MD 20771 A new generation of hypersp ectral imagers requires a much higher absolute accuracy for reflected solar radiation measurements to further improve climate monitoring capabilities. For example, the Climate Absolute Radiance and Refractivity Observatory (CLA RREO) mission, a future satellite mission led and developed by NASA and partner organi zations, is currently considered to consist of two hyperspectral imagers that cover the reflected solar (RS) and infrared radiation. The design of the CLARREO RS instrument operates from 320 to 2300 nm with 4 nm in spectral sampling and 8 nm in spectral resolution. In this study, the sensitivity of spectral coverage, sampling and resolution of the CLARREO RS type instrument is tested for their impacts on integrat ed radiances using the rela tive spectral responses (RSR) of existing broadband sensors. As a proxy, our hype rspectral data is based on MODTRAN simulations and SCIAMACHY observations and the RSR data is from those used in MODIS, VIIRS and AVHRR level 1B (L1B) products. The sensitivity is conducte d for ocean, forest, desert, snow and cloud. Keywords: hyperspectral, reflected solar band, cross-comparison I. INTRODUCTION The goal of the Climate Absolute Radiance and Refractivity Observatory (CLARREO) Mission is to bring unprecedented, high-accuracy revolutionary da ta to climate measurement, as recommended by the National Research Council in 2007