Investigation of forest area and density changes in Middle Zagros using aerial photos interpretation and GIS in the various distances of the village (a case study: Kakareza region, Lorestan province)
Paper Details
Investigation of forest area and density changes in Middle Zagros using aerial photos interpretation and GIS in the various distances of the village (a case study: Kakareza region, Lorestan province)
Abstract
This study located in the Oak trees coppice of kakareza situated on 45th kilometers on the way to Aleshtar from northeast of Khorramabad at the middle area of zagros. In this study cognitional changes (area and accumulation) in various distances from the village of these forests is studied via pictures taken from the air image in (1:55000) and in 1997 (1:40000). For this purpose, geometric corrections are done as the movement correction issued from ups and downs on the pictures taken in the air is performed, then the forest frontier localities are fixed through sight inter pretation and thickness layers of canopy was appointed in a dotted network with the width of 2 millimeters. The frontier line of separated layers is drawn in ArcView software in the form of closed polygons and the area of these polygons are measured separately. Then any changes in area of these polygons in every stage of photographs are compared through software and the layer changes of the thickness of canopy are provided. Then, distance from village maps divided the three classes (0-300 m, 300-600 m and 600-900 m) in two period in Arcview software and from combining each of these maps with density map in the years 1955 and 1997, the forest changes were found in different classes of distance of the village. Results shows that the bulk density of the forest in classes of dense (F 1) and semi-dense (F 2) is with most of the area at a distance away from the village and the lowest area in a distance nearby village. But the class of sparse density (F 3) is with most of the area at a distance nearby the village and the lowest area in a distance away from the village.
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