Further Validation of Perpendicular Drought Index and Modified Perpendicular Drought Index

摘要：

In this paper, performance of newly developed drought indices, perpendicular drought index (PDI) and modified perpendicular drought index (MPDI), is further explored in regional surface dryness monitoring to provide clear guidance on appropriate implementation of these indices over different eco-systems by in-deep analysis of their advantages and constraints. Spatio-temporal patterns of surface drought derived by MODerate Resolution Imaging Spectroradiometer (MODIS) based PDI and MPDI are compared against field measured soil moisture, rainfall and regional hydrological conditions. Results indicate that there are significant negative correlations between the PDI,the MPDI and mean 0-20 cm soil moisture and rainfall. The PDI and the MPDI provides similar results at the early stage of vegetation growth, but remarkable improvements are evident in extracted drought information by MPDI for vegetated surfaces. Therefore, it is recommended to use PDI for bare soil applications since it does not require calculation of additional information such as fraction of vegetation which may contains some uncertainties, but MPDI for vegetated region. This paper confirms further that the MPDI provides more accurate information on surface drought conditions and that the index is robust over various types of surface in different ecosystems.

关键词： Perpendicular drought index (PDI) Modified perpendicular drought index (MPDI) Drought estimation

作者: Abduwasit Ghulam Zhao-Liang Li Timothy Kusky Qiming Qin

作者单位: Center for Environmental Sciences, Saint Louis University, St.Louis, MO, 63103;Laboratoire des Scien Laboratoire des Sciences de lImage, de lInformatique et de la Télédétection, LSIIT UMR7005, 67400, Center for Environmental Sciences, Saint Louis University, St.Louis, MO, 63103 Institute of Remote Sensing and GIS, Peking University, Beijing 100871, China

会议类型: 国际会议

会议名称: 北京国际地理信息系统学术讨论会第七届会议（7th International Workshop Geographical Information System

会议地点: 北京

会议语种:英文

页码: 612-619

在线出版日期: 2007-09-14（万方平台首次上网日期，不代表论文的发表时间）