Arid
DOI10.1109/IGARSS.2007.4423299
Spatial patterns of the canopy stress during 2005 drought in Amazonia
Anderson, Liana O.1; Malhi, Yadvinder1; Aragao, Luiz E. O. C.1; Saatchi, Sassan2
通讯作者Anderson, Liana O.
会议名称IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
会议日期JUL 23-27, 2007
会议地点Barcelona, SPAIN
英文摘要

In the last decades, the detection of drought occurrences and assessment of its severity using satellite data are becoming popular in disaster, desertification, crop production, phenology, land cover change and climate change studies. To detect the drought effects on different vegetation types, many methodologies have been developed, mostly relying on the use of vegetation indices. This communication reports the first attempt to assess the capability of MODIS NDVI, Enhanced Vegetation Index (EVI) and Normalized Difference Water Index (NDWI) from 2000 to 2006 time-series to detect the 2005 drought in Amazonia. To reach this objective, monthly composites of the MOD13A2 product were generated from period. Then, monthly anomalies were calculated, considering anomalous values when lower than -1 standard, deviation (sd) or higher than 1 sd. Rainfall data provided by the Tropical Rainfall Measuring Mission (TRMM) was also acquired for the same time-series with the objective of supporting the understanding of vegetation response with the precipitation. Water deficit data calculated based on the TRMM data were also used to guide the sampling scheme. A land cover map for South America updated with natural land cover changes detected by the Near Real Time Deforestation Detection Project (DETER) was used as a mask to avoid false anomalies in the Brazilian Amazon. In general, NDWI and EVI showed to be sensitive and consistent for the temporal series used. NDVI presented a high variability and though a difficult interpretation. Critical months in the NDWI and EVI series coincided with the months with higher water stress calculated based on the TRMM data. EVI also showed to detect changes in the canopy structure. These preliminary results suggest that this is a strong methodology to be used in the spatial analysis of the extent of the drought effects in the vegetation. Literfall data will be incorporate in this research for validation purposes.


英文关键词Amazon vegetation indices drought MODIS
来源出版物IGARSS: 2007 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM, VOLS 1-12
ISSN2153-6996
出版年2007
页码2294-+
ISBN978-1-4244-1211-2
出版者IEEE
类型Proceedings Paper
语种英语
国家England;USA
收录类别CPCI-S
WOS记录号WOS:000256657302142
WOS关键词TROPICAL FORESTS ; CARBON ; DEFORESTATION
WOS类目Engineering, Electrical & Electronic ; Geosciences, Multidisciplinary ; Remote Sensing
WOS研究方向Engineering ; Geology ; Remote Sensing
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/296568
作者单位1.Oxford Univ Ctr Environm, S Parks Rd, Oxford, England;
2.Jet Propuls Lab Natl Aeronaut & Space Adm, Pasadena, CA USA
推荐引用方式
GB/T 7714
Anderson, Liana O.,Malhi, Yadvinder,Aragao, Luiz E. O. C.,et al. Spatial patterns of the canopy stress during 2005 drought in Amazonia[C]:IEEE,2007:2294-+.
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