Title :
Monitoring Drought Dynamics in the Ejin Oasis using Drought Indices from MODIS Data
Author :
Lin, Meng-Lung ; Cao, Yu ; Juan, Chung-Hsin ; Chen, Cheng-Wu ; Hsueh, I-Chen ; Wang, Qiu-Bing ; Lee, Yung-Tan
Author_Institution :
Dept. of Tourism, Aletheia Univ., Taipei
Abstract :
The Ejin Oasis in arid environments suffers with frequent drought due to insufficient water resources and abnormally high summer-temperature. Detailed analysis of remote sensing data has been carried out for the years 2001-2006. Vegetative drought indices like Vegetation Condition Index (VCI) and Temperature Condition Index (TCI) and Vegetation Health Index (VHI) have been derived using Normalized Difference Vegetation Index (NDVI) values obtained from TERRA/Moderate Resolution Imaging Spectoradiometer (MODIS). Moisture Condition Index (MCI) has been developed to assess hydrological droughts using Normalized Difference Moisture Index (NDMI) values obtained from MODIS/TERRA. Detailed analyses of spatial and temporal drought dynamics for seasons have been compared through drought index maps generated in geographical information systems environments during the 2001 to 2006 period. Analysis and interpretation of these maps will show the spatial patterns of drought with vegetative drought indices and hydrological drought indices. Furthermore, results will help us to identify the high drought risk areas and the short term trend of drought in the Ejin Oasis.
Keywords :
atmospheric temperature; geographic information systems; hydrology; moisture; rain; remote sensing; soil; terrain mapping; vegetation; water resources; AD 2001 to 2006; Ejin Oasis; GIS; MCI; MODIS; Moderate Resolution Imaging Spectoradiometer; Moisture Condition Index; NDMI; NDVI; Normalized Difference Moisture Index; Normalized Difference Vegetation Index; TCI; TERRA; Temperature Condition Index; VCI; VHI; Vegetation Condition Index; Vegetation Health Index; atmospheric precipitation; climate change; data analysis; geographical information system; hydrological drought dynamics monitoring; land cover change; maps analysis; maps interpretation; moisture content; northwest China; remote sensing; vegetative drought index; water resource; High-resolution imaging; Image resolution; Information analysis; MODIS; Moisture; Remote monitoring; Spatial resolution; Temperature sensors; Vegetation mapping; Water resources; Drought; MODIS; NDMI; NDVI; VHI; remote sensing;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2008. IGARSS 2008. IEEE International
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-2807-6
Electronic_ISBN :
978-1-4244-2808-3
DOI :
10.1109/IGARSS.2008.4779852
