Annual and interannual (ENSO) variability of spatial scaling properties of a vegetation index (NDVI) in Amazonia [An article from: Remote Sensing of Environment]

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Description:
The space-time variability of the Normalized Difference Vegetation Index (NDVI) over the Amazon River basin is quantified through the bi-dimensional Fourier spectrum, and moment-scaling analysis of monthly imagery at 8 km resolution, for the period July 1981-November 2002. Monthly NDVI fields exhibit power law Fourier spectra, E(k)=ck^-^@b, with k denoting the wavenumber, c the prefactor, and @b the scaling exponent. Fourier spectra exhibit two scaling regimes separated at approximately 29 km, above which NDVI exhibit long-range spatial correlations (0