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A Re‐examination of Perpendicular Drought Indices over Central and South‐West Asia

Shahabfar, Alireza and Reinwand, Maximilian and Conrad, Christopher and Schorcht, Gunther (2012) A Re‐examination of Perpendicular Drought Indices over Central and South‐West Asia. In: Proceedings of SPIE Remote Sensing 8531 (85311O). SPIE Remote Sensing, 24.-27. Sep 2012, Edinburgh.

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Official URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=1386165


Drought monitoring models and products assist decision makers in drought planning, preparation, and mitigation, all of which can play a role in reducing drought impacts. In this study, the performance of two newly developed remote sensing-based drought indices, the perpendicular drought index (PDI) and modified perpendicular drought index (MPDI), are further explored for regional drought monitoring in agricultural regions located in central and south western Asia. The study area covers regions from moderate and wet climatological zones with dense vegetation coverage to semi-arid and arid climatological conditions with moderate to poor vegetation coverage. The spatio-temporal patterns of surface drought derived by PDI and MPDI from 250m MODerate Resolution Imaging Spectroradiometer (MODIS) data in 8-day time steps are compared against two other drought indices: the Standardized Precipitation Index (SPI) as a meteorological drought index and the potential evapotranspiration (ET0) as an agro-meteorological drought index, which both were calculated based on field-measured precipitation and regional meteorological parameters. In addition, 8-day MODIS Normalized Difference Vegetation Index (NDVI) was calculated and its performance to detect drought occurrence and measuring of drought severity compared with the two perpendicular drought indices. Significant correlations were found between the PDI, the MPDI and precipitation and other applied meteorological and agrometeorological drought indices. The results confirm previous studies which has been analyzing the PDI and the MPDI over some study points in Iran. In this research, however, implementation of higher resolution data (MOD09Q1) in both spatial (250 m) and temporal (8-days) dimensions revealed a greater agreement between the drought information extracted by the MPDI, PDI and field meteorological measurements. It could be concluded that the applied perpendicular indices could be used as a drought early warning system over case study region and other regions with similar arid and semi-arid climatological conditions.

Item URL in elib:https://elib.dlr.de/79103/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:A Re‐examination of Perpendicular Drought Indices over Central and South‐West Asia
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Shahabfar, Alirezaalireza.shahabfar (at) uni-wuerzburg.deUNSPECIFIED
Conrad, ChristopherChristopher.Conrad (at) uni-wuerzburg.deUNSPECIFIED
Schorcht, GuntherGunther.Schorcht (at) uni-wuerzburg.deUNSPECIFIED
Date:24 September 2012
Journal or Publication Title:Proceedings of SPIE Remote Sensing 8531
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Series Name:Remote Sensing for Agriculture, Ecosystems, and Hydrology XIV
Keywords:drought monitoring, time series analysis, perpendicular drought index, Central Asia, MODIS
Event Title:SPIE Remote Sensing
Event Location:Edinburgh
Event Type:international Conference
Event Dates:24.-27. Sep 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Geoscientific remote sensing and GIS methods
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center
Deposited By: Kübert, Carina
Deposited On:14 Feb 2013 11:08
Last Modified:18 Mar 2013 16:55

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