Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1109/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 |
ISSN | 2153-6996 |
出版年 | 2007 |
页码 | 2294-+ |
ISBN | 978-1-4244-1211-2 |
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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