Comparison and Analysis of Statistical and Experimental Methods in Land Slide Hazard Zonation Using Geographical Information System (Study Region: Pishkooh District, Fereidonshahr City)

Landslide is one of natural phenomena which happen due to the falling or massive and often rapid movement of the sediments along amplitudes. Today, this phenomenon has been focused as one of the natural disasters because it causes serious life and financial damage. In this research, Pishkooh district of Fereidonshahr city with an area of 77646 was chosen to evaluate statistical and experimental methods in Isfahan province. then, landslide dispersion map was prepared by using air photographs, to graphical maps, geographical maps and field investigations then ,eight factors were selected from among effective factors on slid including: slope, slope direction, precipitation, land use, distance from fult, distance from canal, distance from road and litho logy. Descriptive and place information was inserted into geographical information system, software Arc map in order to enhance precision, speed, easy analysis and digitizing data. After preparing required information layers, the maps of landslide hazard zonation were prepared using effective parameters on slide with two statistical methods of information Value and density area and Nilsens experimental method. then they were evaluated and finally, their strength and weaknesses were determined. Results showed information value method with po.559QS, 2459 is the best method in terms of precision and the accuracy and after that, density area method with 0.167QS, po.480 are good methods respectively. Therefore, statistical methods have higher precision and accuracy compared with experimental methods and they are more suitable methods for zonation and information value method is more precise and accurate than density area method.