Changes in Vegetation Cover of Yellowstone National Park Estimated from MODIS Greenness Trends, 2000 to 2018

Potter, Christopher [Point of Contact]

关键词: NORMALIZED DIFFERENCE VEGETATION INDEX;    MODIS (RADIOMETRY);    YELLOWSTONE NATIONAL PARK (ID-MT-WY);    VEGETATION;    TRENDS;    TIME SERIES ANALYSIS;    PIXELS;    IMAGING SPECTROMETERS;    ESTIMATING;   

RP-ID  :  ARC-E-DAA-TN70764

学科分类：地球科学(综合)

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Trends and transitions in the MODerate resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) time-series at 250-m resolution were analyzed for the period from 2000 to 2018 to understand recent patterns of vegetation change in Yellowstone National Park (USA). Statistical change in the NDVI time series was detected using the "Breaks for Additive Seasonal and Trend" method (BFAST). This structural change analysis showed that around 30% of abrupt negative shifts in NDVI over the years 2000 to 2018 could be explained by the impacts of recent wildfires. At least one breakpoint could be detected at 12 percent of the 250-m MODIS pixel locations within the entire YNP study area since the year 2000, but that the majority (about 70 percent) of NDVI breakpoints detected in vegetation greenness could be not be explained by the impacts of recent wildfires. Positive growing season NDVI trends were detected across most young forests and regrowing (from recent fire disturbance) woodland cover.