Research Papers

Relationships between Moderate Resolution Imaging Spectroradiometer water indexes and tower flux data in an old growth conifer forest

[+] Author Affiliations
Yen-Ben Cheng, Sonia Wharton, Susan L. Ustin

University of California, Davis

Pablo J. Zarco-Tejada

Instituto de Agricultura Sostenible

Matthias Falk, Kyaw Tha Paw U

University of California, Davis

J. Appl. Remote Sens. 1(1), 013513 (May 23, 2007). doi:10.1117/1.2747223
History: Received January 19, 2007; Revised April 27, 2007; Accepted April 29, 2007; May 23, 2007; Online May 23, 2007
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Abstract

Methods to accurately estimate the biophysical and biochemical properties of vegetation are a major research objective of remote sensing. We assess the capability of the MODIS satellite sensor to measure canopy water content and evaluate its relationship to ecosystem exchange (NEE) for an evergreen forest canopy. A time-series of three vegetation indexes were derived from MODIS data, the Normalized Difference Vegetation Index (NDVI), the Normalized Difference Water Index (NDWI), and the Normalized Difference Infrared Index (NDII), which were compared to physically based estimates of equivalent water thickness (EWT) from the airborne AVIRIS hyperspectral instrument over a temperate conifer forest in southwestern Washington. After cross-calibration of the imagery, water indexes derived from MODIS showed good agreement with AVIRIS EWT, while the NDVI was insensitive to water content variation. Three years of NEE data from eddy covariance measurements at the Wind River AmeriFlux tower were compared with the time series of MODIS indexes, which show seasonal water content has similar trajectory with NEE. In contrast, the MODIS NDVI time series did not yield a good relationship with NEE. This study demonstrates the potential to use MODIS water indexes for spatial and temporal NEE estimation at regional and global scales in appropriate ecosystems.

© 2007 Society of Photo-Optical Instrumentation Engineers

Topics

MODIS ; Water

Citation

Yen-Ben Cheng ; Sonia Wharton ; Susan L. Ustin ; Pablo J. Zarco-Tejada ; Matthias Falk, et al.
"Relationships between Moderate Resolution Imaging Spectroradiometer water indexes and tower flux data in an old growth conifer forest", J. Appl. Remote Sens. 1(1), 013513 (May 23, 2007). ; http://dx.doi.org/10.1117/1.2747223


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