Intercomparison of Seven NDVI Products over the United States and Mexico

Remote Sensing

William Scheftic¹  Xubin Zeng²  Patrick Broxton² 

[1] Department of Atmospheric Sciences, The University of Arizona, Tucson, AZ 85721, USA;

关键词: vegetation fraction;    NDVI;    phenology;    trends;    satellite;    MODIS;    AVHRR;    SPOT;   

DOI  :  10.3390/rs6021057

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland