文章基本信息

标题：A Statistical and Spatial Analysis of Portuguese Forest Fires in Summer 2016 Considering Landsat 8 and Sentinel 2A Data
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作者：Ana Teodoro ; Ana Teodoro ; Ana Amaral 等
期刊名称：Environments
电子版ISSN：2076-3298
出版年度：2019
卷号：6
期号：3
页码：36
DOI：10.3390/environments6030036
出版社：MDPI Publishing
摘要：Forest areas in Portugal are often affected by fires. The objective of this work was to analyze the most fire-affected areas in Portugal in the summer of 2016 for two municipalities considering data from Landsat 8 OLI and Sentinel 2A MSI (prefire and postfire data). Different remote sensed data-derived indices, such as Normalized Difference Vegetation Index (NDVI) and Normalized Burn Ratio (NBR), could be used to identify burnt areas and estimate the burn severity. In this work, NDVI was used to evaluate the area burned, and NBR was used to estimate the burn severity. The results showed that the NDVI decreased considerably after the fire event (2017 images), indicating a substantial decrease in the photosynthesis activity in these areas. The results also indicate that the NDVI differences (dNDVI) assumes the highest values in the burned areas. The results achieved for both sensors regarding the area burned presented differences from the field data no higher than 13.3% (for Sentinel 2A, less than 7.8%). We conclude that the area burned estimated using the Sentinel 2A data is more accurate, which can be justified by the higher spatial resolution of this data.
关键词：NDVI; NBR; Sentinel 2A MSI; Landsat 8 OLI; prefire event; postfire event NDVI ; NBR ; Sentinel 2A MSI ; Landsat 8 OLI ; prefire event ; postfire event