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Environmental land use Change detection and assessment using with multi-temporal satellite imagery
Mohsen Ahadnejad
Zanjan University
E-mail: ahadnejad@mail.znu.ac.ir
Introduction
Environmental protection is faced a critical problems due to several factors as the increasing population, demolishing natural resources, environmental pollution, land use planning as well as others. Presently unplanned changes of land use have become a major problem. Most land use changes occur without a clear and logical planning with any attention to their environmental impacts. Major Flooding, air pollution in large cities as well as deforestation, urban growth, soil erosion, desertification, are all consequences of a mismanaged planning without considering environmental impacts of development planes. Desertification is a common consequence of improper land use change.
Many authors have experienced employment of satellite imageries for land use mapping as well as change detection studies. Sunarar (1966) has compared the results of five different techniques of band combination, subtraction, band division, principal component analysis and classification in Ekitally, Turkey. This study revealed a better result in case of principal component analysis and comparison of the classification results. Gupta and Parakash (1998) used a combined method of color composite, band subtraction, band division and supervised classification to prepare a land use map for change detection studies in a coal-mining district in India. He concluded that the supervised classification gives a better result for detecting changes.
Lashkari (1377) has used probability index method and fuzzy to analyses multi-temporal TM imageries for land use changes detection mapping in city of Mashhad . Varasteh Moradi (1996) has employed Markoff Hierarchy to predict land use changes in Gillan Province.
At The present research supervised classification has been employed to study land use changes occurred in Maragheh region. Furthermore ecological models have also been used to analyze environmental impacts of land use changes in the area.
Study Area:
Study area is located between 37 14-37 30 north latitude and 45 59-46 16 east longitude. The area covers Bonab and Maragheh cities comprising the three topographic units of mountains, foothills and plain. The main reason to select this area is the considerable land use changes occurring in the area as urban development, rural development, Alavian Dam construction, and major changes in crop pattern in the area.
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