Remote Sens. 2016, 8(1), 34; doi:10.3390/rs8010034
Spectral Cross-Calibration of VIIRS Enhanced Vegetation Index with MODIS: A Case Study Using Year-Long Global Data
1
National Institute of Advanced Industrial Science and Technology (AIST), Geological Survey of Japan, the Research Institute of Geology and Geoinformation, Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
2
Department of Natural Resources and Environmental Management, University of Hawaii at Manoa, 1910 East West Road, Sherman 101, Honolulu, HI 96822, USA
3
Department of Information Science and Technology, Aichi Prefectural University, 1522-3 Ibara, Nagakute, Aichi 480-1198, Japan
4
The Plant Functional Biology and Climate Change Cluster, University of Technology Sydney, P.O. Box 123, Broadway NSW 2007, Australia
5
Center for Satellite Applications and Research, National Oceanic and Atmospheric Administration, College Park, MD 20740, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Changyong Cao, Dongdong Wang and Prasad S. Thenkabail
Received: 6 November 2015 / Revised: 26 December 2015 / Accepted: 29 December 2015 / Published: 5 January 2016
(This article belongs to the Special Issue Calibration/Validation of Visible Infrared Imaging Radiometers and Applications)
Abstract
In this study, the Visible Infrared Imaging Radiometer Suite (VIIRS) Enhanced Vegetation Index (EVI) was spectrally cross-calibrated with the Moderate Resolution Imaging Spectroradiometer (MODIS) EVI using a year-long, global VIIRS-MODIS dataset at the climate modeling grid (CMG) resolution of 0.05°-by-0.05°. Our cross-calibration approach was to utilize a MODIS-compatible VIIRS EVI equation derived in a previous study [Obata et al., J. Appl. Remote Sens., vol.7, 2013] and optimize the coefficients contained in this EVI equation for global conditions. The calibrated/optimized MODIS-compatible VIIRS EVI was evaluated using another global VIIRS-MODIS CMG dataset of which acquisition dates did not overlap with those used in the calibration. The calibrated VIIRS EVI showed much higher compatibility with the MODIS EVI than the original VIIRS EVI, where the mean error (MODIS minus VIIRS) and the root mean square error decreased from −0.021 to −0.003 EVI units and from 0.029 to 0.020 EVI units, respectively. Error reductions on the calibrated VIIRS EVI were observed across nearly all view zenith and relative azimuth angle ranges, EVI dynamic range, and land cover types. The performance of the MODIS-compatible VIIRS EVI calibration appeared limited for high EVI values (i.e., EVI > 0.5) due likely to the maturity of the VIIRS dataset used in calibration/optimization. The cross-calibration methodology introduced in this study is expected to be useful for other spectral indices such as the normalized difference vegetation index and two-band EVI. View Full-TextKeywords:
EVI; VIIRS; MODIS; spectral compatibility; cross-calibration; CMG data
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Obata, K.; Miura, T.; Yoshioka, H.; Huete, A.R.; Vargas, M. Spectral Cross-Calibration of VIIRS Enhanced Vegetation Index with MODIS: A Case Study Using Year-Long Global Data. Remote Sens. 2016, 8, 34.
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