HR: 13:40h
AN: B33D-01    [Abstracts]
TI: A long-term Land data record from AVHRR, MODIS and VIIRS
AU: * Saleous, N Z
EM: nazmi.saleous@gsfc.nasa.gov
AF: NASA GSFC, code 922, Greenbelt, MD 20771 United States
AU: Vermote, E F
EM: eric@kratmos.gsfc.nasa.gov
AF: University of Maryland, Dept. of Geography 1113 Lefrak Hall, College Park, MD 20742 United States
AB: As a first step to creating a land surface long-term data record from AVHRR, MODIS and VIIRS, we plan to reprocess 23 years worth of AVHRR data (1981-now) using algorithms based on improvements identified in the AVHRR Pathfinder 2 project and on the knowledge gained from our MODIS surface reflectance work. In this presentation, we will describe the different steps in the processing chain leading to a consistent data record. In particular, we will discuss the vicarious calibration approach using accurate Rayleigh computations and observations over ocean and clouds to determine the calibration decay in the different AVHRR sensors. This approach was applied consistently to the AVHRR instruments in orbit since 1981 and was evaluated using coincident AVHRR and MODIS data acquired over invariant desert targets. Results of the evaluation and an estimate of the AVHRR calibration accuracy will be presented. In addition to evaluating the calibration approach, the coincident AVHRR and MODIS period is used to establish the AVHRR reflectance product accuracy and to study the impact of spectral differences between AVHRR and MODIS on Land products.
DE: 1694 Instruments and techniques
DE: 1699 General or miscellaneous
DE: 1640 Remote sensing
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting