چكيده لاتين :
Coast is a uniqueenvironment in whichatmosphere, hydrosphere and lithosphere contact each other.
Coastline is one of the most important linear features on the earthיs surface, which displaya dynamic nature. Coastal
zone, and its environmental management requires the information about coastlines and their changes. This paper
examines the current methods of coastline change detection using satellite images. Based on the advantages and
drawbacks of the methods, a new procedure has been developed. The proposed procedure is based on a combination
of histogram thresholding and band ratio techniques. The study area of the project is Unnia Lake; the 20th
. largest,and
the second hyper saline lake in the world. In order to assess the accuracyof the results, they have been compared with
ground truth observations. The accuracy of the extracted coastline has been estimatedas 1.3 pixels (pixel size=30 m).
Based on this investigation, the area of the lake has been decreasedapproximately 1040 square kilometers from August
1998 to August 2001. This result has been verified through TOPEXIPosidon satellite information that indicates a
height variation of three meters
