Continuous 1985–2012 Landsat Monitoring to Assess Fire Effects on Meadows in Yosemite National Park, California
作者： Christopher Soulard , Christine Albano , Miguel Villarreal , Jessica Walker
DOI: 10.3390/RS8050371
关键词:
摘要: To assess how montane meadow vegetation recovered after a wildfire that occurred in Yosemite National Park, CA 1996, Google Earth Engine image processing was applied to leverage the entire Landsat Thematic Mapper archive from 1985 2012. Vegetation greenness (normalized difference index (NDVI)) summarized every 16 days across 28-year time series for 26 meadows. Disturbance event detection hindered by subtle influence of low-severity fire on vegetation. A hard break (August 1996) identified corresponding Ackerson Fire, and monthly composites were used compare NDVI values trends within burned unburned meadows before, immediately after, continuously more than decade following date. Results indicate significantly lower at 95% confidence level date, yet not Burned continued exhibit dormant season through Over monitoring period, negative-trending, slopes also 90% level. Lower average compared meadows, coupled with photographic evidence, strongly suggest evergreen removed periphery some fire. These analyses provide insight into satellite imagery can be monitor effects
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