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Open AccessArticle

The Generalized Difference Vegetation Index (GDVI) for Dryland Characterization

ICARDA (International Center for Agricultural Research in the Dry Areas), CGIAR, P.O. Box 950764, Amman 11195, Jordan
This paper is an extension version of the paper presented in the 8th International Soil Sciences Congress (ISSC), Izmir, Turkey, 15–17 May 2012.
Remote Sens. 2014, 6(2), 1211-1233;
Received: 3 November 2013 / Revised: 24 December 2013 / Accepted: 2 January 2014 / Published: 29 January 2014
A large number of vegetation indices have been developed and widely applied in terrestrial ecosystem research in the recent decades. However, a certain limitation was observed while applying these indices in research in dry areas due to their low sensitivity to low vegetation cover. In this context, the objectives of this study are to develop a new vegetation index, namely, the Generalized Difference Vegetation Index (GDVI), and to examine its applicability to the assessment of dryland environment. Based on the field investigation and crop Leaf Area Index (LAI) measurement, five spring and summer Landsat TM and ETM+ images in the frame with Path/Row number of 174/35, and MODIS (Moderate Resolution Imaging Spectroradiometer) LAI and vegetation indices (VIs) data (MOD15A2 and MOD13Q1), of the same acquisition dates as the Landsat images, were acquired and employed in this study. The results reveal that, despite the same level of correlation with the fractional vegetation cover (FVC) as other VIs, GDVI shows a better correlation with LAI and has higher sensitivity and dynamic range in the low vegetal land cover than other vegetation indices, e.g., the range of GDVI is higher than Normalized Difference Vegetation Index (NDVI),Soil-Adjusted Vegetation Index (SAVI), Enhanced Vegetation Index (EVI), Wide Dynamic Range Vegetation Index (WDRVI), and Soil-Adjusted and Atmospherically Resistant Vegetation Index (SARVI), by 164%–326% in woodland, 185%–720% in olive plantation, and 190%–867% in rangeland. It is, hence, concluded that GDVI is relevant for, and has great potential in, land characterization, as well as land degradation/desertification assessment in dryland environment. View Full-Text
Keywords: GDVI; LAI; vegetation indices; sensitivity; dynamic range; land characterization; dryland environment GDVI; LAI; vegetation indices; sensitivity; dynamic range; land characterization; dryland environment
MDPI and ACS Style

Wu, W. The Generalized Difference Vegetation Index (GDVI) for Dryland Characterization. Remote Sens. 2014, 6, 1211-1233.

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