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Remote Sens. 2012, 4(7), 2156-2180; doi:10.3390/rs4072156
Article

Analysis of the Scaling Effects in the Area-Averaged Fraction of Vegetation Cover Retrieved Using an NDVI-Isoline-Based Linear Mixture Model

1,2,†, 2
 and 1,*
Received: 16 May 2012; in revised form: 11 July 2012 / Accepted: 11 July 2012 / Published: 18 July 2012
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Abstract: The spectral unmixing of a linear mixture model (LMM) with Normalized Difference Vegetation Index (NDVI) constraints was performed to estimate the fraction of vegetation cover (FVC) over the earth’s surface in an effort to facilitate long-term surface vegetation monitoring using a set of environmental satellites. Although the integrated use of multiple sensors improves the spatial and temporal quality of the data sets, area-averaged FVC values obtained using an LMM-based algorithm suffer from systematic biases caused by differences in the spatial resolutions of the sensors, known as scaling effects. The objective of this study is to investigate the scaling effects in area-averaged FVC values using analytical approaches by focusing on the monotonic behavior of the scaling effects as a function of the spatial resolution. The analysis was conducted based on a resolution transformation model introduced recently by the authors in the accompanying paper (Obata et al., 2012). The maximum value of the scaling effects present in FVC values was derived analytically and validated numerically. A series of derivations identified the error bounds (inherent uncertainties) of the averaged FVC values caused by the scaling effect. The results indicate a fundamental difference between the NDVI and the retrieved FVC from NDVI, which should be noted for accuracy improvement of long-term observation datasets.
Keywords: fraction of vegetation cover; scaling effect; monotonicity; NDVI; resolution transformation model fraction of vegetation cover; scaling effect; monotonicity; NDVI; resolution transformation model
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.

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MDPI and ACS Style

Obata, K.; Miura, T.; Yoshioka, H. Analysis of the Scaling Effects in the Area-Averaged Fraction of Vegetation Cover Retrieved Using an NDVI-Isoline-Based Linear Mixture Model. Remote Sens. 2012, 4, 2156-2180.

AMA Style

Obata K, Miura T, Yoshioka H. Analysis of the Scaling Effects in the Area-Averaged Fraction of Vegetation Cover Retrieved Using an NDVI-Isoline-Based Linear Mixture Model. Remote Sensing. 2012; 4(7):2156-2180.

Chicago/Turabian Style

Obata, Kenta; Miura, Tomoaki; Yoshioka, Hiroki. 2012. "Analysis of the Scaling Effects in the Area-Averaged Fraction of Vegetation Cover Retrieved Using an NDVI-Isoline-Based Linear Mixture Model." Remote Sens. 4, no. 7: 2156-2180.


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