Mohammad Amozad mahdiraji; gholamali jalali; abbas Alipour; mohammad hossein Papeli Yazdi
Abstract
Iranian northern forests have been damaged due to easy accessible, population increase and ets. with human-made in recent decades. Evaluating land-use changes is one of the main method to monitor and manage natural resources. The present study was conducted in Babolakrood sub-basin, Mazandaran province, ...
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Iranian northern forests have been damaged due to easy accessible, population increase and ets. with human-made in recent decades. Evaluating land-use changes is one of the main method to monitor and manage natural resources. The present study was conducted in Babolakrood sub-basin, Mazandaran province, northern Iran that has estimated to be 14896 hectares, with population to amount to 1521 families containing small villages.We studied land-use change and land grabbing in four periods 1966, 1994, 2003 . 2013 by cover images and LANDSAT imagery. After preparing sub-basin boundary, the process of digital and aerial images was conducted by Microstation, Erdas, ArcGIS and Autocad. Then, area alteration of arable lands, residential places and roads were compared during the four periods. The results have shown that the most area alterations raised in the first period from 1966 to 1994 as conversion of ranges and forests to arable lands. During 1966 to 2013 period, the area of 413 hectares equal to 3 percents (8.8 hectares per year) of ranges and forests reduced to other uses.
jamal mosaffaie; mohammad reza ekhtesasi; Amin Saleh pourjam
Abstract
Study of geological units is one of the basic studies in many different sciences such as natural resources. The use of geological maps produced by geological survey is now the basic of geological studies in detailed-operating and investigative studies of natural resources. On the other hand, during the ...
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Study of geological units is one of the basic studies in many different sciences such as natural resources. The use of geological maps produced by geological survey is now the basic of geological studies in detailed-operating and investigative studies of natural resources. On the other hand, during the last years, remote sensing technology has been introduced as a new and efficient tool for geological studies that in addition to proper precision, it has other benefits such as accessibility to impassable or inaccessible mountainous regions. In this study, comparing the accuracy of existing geological and remote sensing maps of Vartavan catchment of Qazvin province has been the object of the study which was evaluated with the ground realities. So first, maps of geological survey were examined. Then, various image processing techniques including False Color Composite (FCC), Principal Component Analysis (PCA), Optimum Index Factor (OIF) and Band Ratio (BR) were used to enhance different lithological units and finally, RS lithology map of the catchment was prepared. Considering the variety of rocks and formations of the study area, the FCC and OIF techniques have respectively the most capabilities for differentiation of the rocks. Kappa coefficient of 0.39 between the two maps indicates low agreement between them. Checking the accuracy of maps based on the ground realities showed that photo-lithological map is more accurate (97.1%) compared to geological map (52.5%).