Long Range Correlation in Vegetation Over West Africa From 1982 to 2011

Satellite-derived Normalized Difference Vegetation index (NDVI) data records offer important sources for long term correlation modelling over West Africa. In this study, we assessed long range correlations in half monthly NDVI records over West Africa from 1982 to 2011 using GIMMS NDVI. In our analy...

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Bibliographic Details
Published in:IEEE access 2019, Vol.7, p.119151-119165
Main Authors: Igbawua, Tertsea, Zhang, Jiahua, Yao, Fengmei, Ali, Shahzad
Format: Article
Language:English
Subjects:
Africa
Confidence intervals
Correlation
Correlation analysis
ecological zones
Environmental management
Fluctuations
Fractals
Long range correlation
multifractality
NDVI
NOAA AVHRR
Normalized difference vegetative index
Random walk
Regression analysis
Statistical analysis
Time series analysis
Trend analysis
Trends
Vegetation
Vegetation index
Vegetation mapping
West Africa
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Summary:Satellite-derived Normalized Difference Vegetation index (NDVI) data records offer important sources for long term correlation modelling over West Africa. In this study, we assessed long range correlations in half monthly NDVI records over West Africa from 1982 to 2011 using GIMMS NDVI. In our analysis, we assessed (a) the annual and seasonal trends obtained using Ordinary Linear Regression, (b) the detrended lag-1-autocorrelation C(1), (c) the Detrended Fluctuation Analysis (DFA) scaling Hurst exponent h and (d) the Multifractal (MF) characteristics of NDVI. Results show that there exist some patterns or trends in the records that persist over time. The value of C(1) for NDVI was obtained as 0.989 is significant at 95% confidence interval. Consequently, the scaling h values of the Hurst DFA showed that about 37.4, 20.5, 41.7 and 0.5% of the vegetated areas are anti-correlated (h
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2019.2933235