NDLI: An Algorithm to Produce Temporally and Spatially Continuous MODIS-LAI Time Series

Content Provider	IEEE Xplore Digital Library
Author	Feng Gao Morisette, J.T. Wolfe, R.E. Ederer, G. Pedelty, J. Masuoka, E. Myneni, R. Bin Tan Nightingale, J.
Copyright Year	2004
Abstract	Ecological and climate models require high-quality consistent biophysical parameters as inputs and validation sources. NASA's moderate resolution imaging spectroradiometer (MODIS) biophysical products provide such data and have been used to improve our understanding of climate and ecosystem changes. However, the MODIS time series contains occasional lower quality data, gaps from persistent clouds, cloud contamination, and other gaps. Many modeling efforts, such as those used in the North American Carbon Program, that use MODIS data as inputs require gap-free data. This letter presents the algorithm used within the MODIS production facility to produce temporally smoothed and spatially continuous biophysical data for such modeling applications. We demonstrate the algorithm with an example from the MODIS-leaf-area-index (LAI) product. Results show that the smoothed LAI agrees with high-quality MODIS LAI very well. Higher R-squares and better linear relationships have been observed when high-quality retrieval in each individual tile reaches 40% or more. These smoothed products show similar data quality to MODIS high-quality data and, therefore, can be substituted for low-quality retrievals or data gaps.
Sponsorship	IEEE Geoscience and Remote Sensing Society
Starting Page	60
Ending Page	64
Page Count	5
File Size	231972
File Format	PDF
ISSN	1545598X
Volume Number	5
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	MODIS NASA Clouds Ecosystems Information systems Contamination Filling Data analysis Pollution measurement Space technology time-series data analysis Biophysical parameters gap filling Moderate Resolution Imaging Spectroradiometer (MODIS) land products remote sensing
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Geotechnical Engineering and Engineering Geology

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THE MODERATE Resolution Imaging Spectroradiometer

An Inductive Approach to Simulating Multispectral MODIS Surface Reflectance Time Series

Using Page's Cumulative Sum Test on MODIS Time Series to Detect Land-Cover Changes

Implementation on Landsat Data of a Simple Cloud-Mask Algorithm Developed for MODIS Land Bands

Snow and ice mask for the MODIS aerosol products

Toward the Use of the MODIS ET Product to Estimate Terrestrial GPP for Nonforest Ecosystems

Gap-Filling of MODIS Time Series Land Surface Temperature (LST) Products Using Singular Spectrum Analysis (SSA)

Evaluation of MODIS Land Cover and LAI Products in Cropland of North China Plain Using In Situ Measurements and Landsat TM Images

Land Surface Air Temperature Retrieval From EOS-MODIS Images

An Algorithm to Produce Temporally and Spatially Continuous MODIS-LAI Time Series

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THE MODERATE Resolution Imaging Spectroradiometer

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