Development Process and Frontier Hotspot Visualization Analysis of NDVI Spatiotemporal Evolution Research in China
The study of the spatial and temporal evolution of NDVI helps to deeply under-stand the operation mechanism of the ecological system and the environmental change response pro-cess,which is important for understanding the law of vegetation growth,the protection of the ecologi-cal environment,and the sustainable development.Research from the perspective of objective measure-ment and knowledge map,using visualization tools CiteSpace,the CNKI search 463 sample literature,from the literature quantity distribution,the author and institutions,high download cited and keywords,cluster sequence,sudden visualization analysis,the results show:domestic NDVI time and space evolu-tion research started late,development present obvious stage characteristics,can roughly its initial Germ period(2001-2006),exploration generation period(2007-2012),steady development period(2013-2018)and rapid growth period(2019 to now);The research field is characterized by one-core aggregation,multi-point connection and general dispersion,without a core author group;the research field of increasing literature and increasing influence;Key words such as spatial and temporal change,vegetation coverage,climate change and remote sensing are the main research hotspots,while the fron-tier is response,correlation,vegetation index,phenology and influencing factors.It focuses on the pre-diction of the relationship between NDVI and climate change and human activities and the simulation of timely empty evolution..
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