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Vegetation Index EDR from Suomi NPP VIIRS: An Overview of the Current Status
Tomoaki
Miura, University of Hawaii, tomoakim@hawaii.edu
(Presenter)
Spectral vegetation indices (VIs) are one of the important satellite products for monitoring terrestrial vegetation and characterizing their seasonal dynamics and interannual variability in regional to global scales. A new vegetation index data record has begun to be collected with the Visible/Infrared Imager/Radiometer Suite (VIIRS) sensor series. The first VIIRS sensor onboard the Suomi National Polar-orbiting Partnership (NPP) spacecraft, a precursor to the Joint Polar Satellite System (JPSS), was successfully launched in October 2011. VIIRS is slated not only to replace the AVHRR sensor series in the afternoon orbit, but also planned to continue the highly calibrated satellite data stream begun with EOS-MODIS. Both the NDVI and EVI have been selected as one of the VIIRS geophysical products, termed environmental data records (EDRs) in the JPSS program. VIIRS VI EDR is generated on a daily basis at 375m spatial resolution. This presentation provides the current status of VIIRS VI EDR obtained from evaluation and analysis of the first year of VIIRS data. VIIRS VI EDR has shown good, stable radiometric performance where both the NDVI and EVI of VIIRS have consistently been comparable with the Aqua MODIS counterpart over time, and across space and a range of view zenith angles. Several quality issues were observed, including residual cloud contaminations, occasional overcorrection of atmospheric effects, and unrealistic EVI values, which are, however, expected to improve in near future. VIIRS VI EDR has been declared as a “Beta” quality level as of May 2, 2012 and released on January 2013. We are continuing with additional product validation and improvement efforts, which include revised quality flags, cross-sensor EVI compatibility, and temporal compositing prototyping.
Presentation Type: Poster
Session: Poster Session 2-A
(Wed 11:00 AM)
Associated Project(s):
Poster Location ID: 67
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