ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 3, pp. 196-205

Assessment of arid ecosystems dynamics based on the results of automated processing of multispectral satellite imagery time series

R. Kharazmi 1 , E.А. Panidi 1 , L.N. Chaban 2 
1 Saint Petersburg State University, Saint Petersburg, Russia
2 Moscow State University of Geodesy and Cartography, Moscow, Russia
Accepted: 15.05.2017
DOI: 10.21046/2070-7401-2017-14-3-196-205
Detection of changes on the Earth's surface allows to assess spatiotemporal patterns of land evolution and to determine their quantitative parameters. This study is aimed on the assessment of seasonal dynamics of the Hamoun Wetlands located in the Sistan Basin (delta of the Helmand River, eastern part of Iran and western part of Afghanistan). The dynamics of the lake depends directly on water amounts in the rivers flowing from the remote sources. Climate and anthropogenic factors influence strongly the dynamics of the analyzed territory. The authors used multispectral Landsat imagery acquired during the past 30 years. The supervised maximum likelihood imagery classification algorithm was used to detect changes in the study area. Lands were classified into four generalized types (water surface, flooded vegetation, grasslands and bare land). Changes in areas of these types were studied in order to quantify changes of lands. The calendar seasons over the past 30 years were taken into account. Obtained results show that the estimates of land type dynamics based on data collected in spring and summer seasons demonstrate higher convergence than the estimates based on data collected in spring and autumn seasons. The results of the overall (averaged over all seasons) assessment show that there was a significant decrease in the areas of vegetation cover and water surfaces in 2000–2004. In addition, it was revealed (by comparing data for 1987, 2001 and subsequent years) that the area of wastelands in the region can increase significantly due to the decrease of water bodies and flooded areas. Obtained results can be used for planning monitoring campaigns and study of changes in natural ecosystems of arid regions.
Keywords: multispectral imagery, Helmand River, landcover change, Hamoun Wetlands, Sistan Basin
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