M. J. Valadan Zouj; Y. Rezaei; F. Vaziri; M.R. Mobasheri
Abstract
A considerable portion of potable water in Iran is supplied by natural glaciers, and then the study and protection of these resources are a necessity. This investigation includes the assessment of glacier parameters such as maximum and minimum altitude, area and perimeter, position of snow line and etc. ...
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A considerable portion of potable water in Iran is supplied by natural glaciers, and then the study and protection of these resources are a necessity. This investigation includes the assessment of glacier parameters such as maximum and minimum altitude, area and perimeter, position of snow line and etc. Since direct measurement of these parameters in the field is time consuming and expensive, therefore, some techniques such as remote sensing seem to be more useful and plausible. In this regards, one can deploy different algorithms for detection of the glacier region as well as calculation of relevant important parameters. To achieve this goal, the resolution of satellite images in spatial, spectral and radiometric aspects should be studied and assessed. In this research, satellite images with different resolutions have been used to study the Alam Chal Glacier. Using different satellite images, the glacier parameters have been identified and studied and the most appropriate images which can provide the necessary precision for this task were identified. Also the potentiality of DEM (Digital Elevation Model) in combination with satellite images in order to obtain the glacier geometric elements such as the topography of cirque, maximum and minimum height, the topography of the district and watershed, has been investigated.
Y. Rezaei; M. J. Valadan Zoej; F. Vaziri
Abstract
Considering glaciers as a main source of potable water in Iran, their investigations and protection are necessary. It means their parameters such as maximum and minimum altitude, area and perimeter, position of snow line and etc, should be estimated. In a time and expenses point of view, regarding research ...
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Considering glaciers as a main source of potable water in Iran, their investigations and protection are necessary. It means their parameters such as maximum and minimum altitude, area and perimeter, position of snow line and etc, should be estimated. In a time and expenses point of view, regarding research difficulties in these areas when using direct measurements approach and field working, remote sensing technology seems to be useful and efficient. IRS and ASTER satellite images, Arial photographs and DEM, have been used to identify and estimate different glacier parameters of Khersan glacier in the Zardkuh Mountain. Using various unsupervised classification algorithms on Aster images, different parts of glaciers are classified. Feature space and spectral wave of snow and ice have been used to recognize various parts of glacier, such as ice, last years frozen snow as well as frost snow. Ultimately DEM, fused images, information extracted from classification methods, and vision interpretation, have been applied to up to date the old map of the region and extract the boundary of glacier
