Remote Sens. 2014, 6(2), 1057-1084; doi:10.3390/rs6021057
Article

Intercomparison of Seven NDVI Products over the United States and Mexico

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Received: 4 December 2013; in revised form: 15 January 2014 / Accepted: 16 January 2014 / Published: 27 January 2014
(This article belongs to the Special Issue Monitoring Global Vegetation with AVHRR NDVI3g Data (1981-2011))
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.
Abstract: Satellites have provided large-scale monitoring of vegetation for over three decades, and several satellite-based Normalized Difference Vegetation Index (NDVI) datasets have been produced. Here we intercompare four long-term NDVI datasets based largely on the AVHRR sensor (NDVIg, NDVI3g, STAR, VIP) and three datasets based on newer sensors (SPOT, Terra, Aqua) and evaluate the effectiveness of homogenizing the datasets using the green vegetation fraction (GVF) and the impact it has on phenology trends. Results show that all NDVI datasets are highly correlated with each other. However, there are significant differences in the regression slopes that vary spatially and temporally. There is a general trend towards higher maximum annual NDVI over much of the temperate forests of the US and a longer greening period due mostly to a delayed end of the season. These trends are less well-defined over rainfall dependent ecosystems in Mexico and the southwest US Compared with the NDVI datasets, the derived GVF datasets show more one-to-one relationships, have reduced interannual variation, preserve their relationships better over the entire time period and are characterized by weaker trends. Finally, weak agreement between the trends in the datasets stresses the importance of using multiple datasets to evaluate changes in vegetation and its phenology.
Keywords: vegetation fraction; NDVI; phenology; trends; satellite; MODIS; AVHRR; SPOT
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MDPI and ACS Style

Scheftic, W.; Zeng, X.; Broxton, P.; Brunke, M. Intercomparison of Seven NDVI Products over the United States and Mexico. Remote Sens. 2014, 6, 1057-1084.

AMA Style

Scheftic W, Zeng X, Broxton P, Brunke M. Intercomparison of Seven NDVI Products over the United States and Mexico. Remote Sensing. 2014; 6(2):1057-1084.

Chicago/Turabian Style

Scheftic, William; Zeng, Xubin; Broxton, Patrick; Brunke, Michael. 2014. "Intercomparison of Seven NDVI Products over the United States and Mexico." Remote Sens. 6, no. 2: 1057-1084.

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