Document Type : Research Paper

Author

Assistant Professor, Geography Department, Human Sciences faculty, Golestan University, Gorgan, Iran

Abstract

The face of the earth is always changing due to human activities and natural phenomena. Therefore, in order to optimize the management of the natural areas, knowledge of the ratio of land cover / land use changes is considered necessary.The present study was conducted to detect changes in land cover/land use in Abdanan region over a period of 25 years. In order to carry out the research, images of the years of 1985, 2000 and 2010 from TM, ETM + and TM sensors of Landsat satellite were used, and the map of the change detection was prepared and the final results was presented after performing the necessary corrections in the preprocessing stage, by the object-oriented classification of the images in the IdrisiSelvi software environment.The results show that during the period from 1985 to 2010, we are witnessing the decreasing trend of lands with moderate and good rangeland cover, which indicates the general trend of destruction in the region through the replacement of moderate and good pastures by the uses of poor pasture and barren lands. The extracted coefficients of validity assessment (total accuracy and kappa coefficient of 95% and 94% respectively) indicate the high accuracy of this classification method.
According to the results obtained from this research, it is suggested that the object-oriented classification method to be used in the preparation of land cover / land use maps and also the detection of changes.

Keywords

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