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Funded Research

Science Data Analysis Including TIR BRDF Retrieval for Improvements of the MODIS Land-Surface Temperature/Emissivity Products in Long-term Accuracy and Consistency.

Wan, Zhengming: Univ. CA, Santa Barbara (Project Lead)

Project Funding: 2011 - 2014

NRA: 2009 NASA: The Science of Terra and Aqua   

Funded by NASA

Abstract:
In this Science Data Analysis proposal, science data analysis with various approaches including TIR BRDF retrieval will be made to refine the existing algorithms and PGE code for the standard MODIS Land-Surface Temperature/Emissivity (LST/E) products in order to improve their long-term accuracy and consistency. Major refinements include 1) using yearly or seasonal averaged surface emissivities from C6 MODIS LST products as initial values in the day/night algorithm; 2) using multi-day Terra and Aqua MODIS data in a BRDF scheme for retrieving stable BRDF parameters in bands 20, 22 and 23 so that the angular variation in surface emissivities in all bands may be well modeled; 3) refining the MODIS cloudmask product collaboratively with the cloudmask group to fix the discontinuity problem in LSTs along latitude of ±60o. The long-term quality and consistency of the MODIS LST/E products will be verified by science data analysis of the LST/E correlations with independent data sets of MODIS NDVI, surface observation data of precipitation and soil moisture. Combined with surface emissivity spectra measured by a high-quality TIR Fourier-transfer spectroradiometer with a sun-shadow method in the field and by a TIR spectroradiometer and integrating sphere system in laboratory from terrestrial samples, atmospheric temperature and water vapor profiles from conventional radiosonde and NCEP will be used in a radiance-based approach to validate the LST products over 40 sites on the global land. Error and uncertainty analysis will be made to quantify errors and uncertainties associated with input data and algorithms.

2011 NASA Carbon Cycle & Ecosystems Joint Science Workshop Poster(s)

  • Activities of the CEOS Land Product Validation (LPV) Sub­group   --   (Joanne Michelle Nightingale, Jaime Nickeson, Gabriela Schaepman-Strub)   [abstract]

More details may be found in the following project profile(s):