Classification Of Forest Fire Risk In Hongya County Based On GIS Technology

Based on the historical forest fire statistics of Hongya County,combined with the 2015 TM remote sensing image data,DEM data,meteorological data and other data,this paper uses ENVI and Arcgis software to extract and analyze forest fire impact factors.Using the analytic hierarchy process to construct the forest fire risk assessment index system of Hongya County,use yaahp software to construct the fire risk factor judgment matrix,divide the weight of the forest fire risk impact factor of Hongya County,and determine the weight coefficient of different impact factors.Using the spatial modeling function,the thematic maps are superimposed and analyzed according to the weighting factors and grading values of different factors,and finally the forest fire risk zoning map of Hongya County is obtained.The main conclusions are:1.Different factors have different effects on forest fires.This paper uses topographic factors,meteorological factors,vegetation factors and human factors to analyze them separately.The human factor has the largest weight,accounting for 0.5987.The topographic factor has the smallest weight,accounting for 0.0932.The weight of each factor is from highway buffer to vegetation type.Rainfall,temperature,aspect,elevation,slope.Human disturbance is the main influencing factor of forest fires in Hongya County.2.The spatial modeling function obtained has obtained the forest fire risk zoning map of Hongya County,which is divided into five grades,which are extremely low,low,medium,high and extremely high fire danger zones.The high fire danger zone and the extremely high fire danger zone have a total area of 35201.81hm~2,accounting for 26.13%of the total area of the county.It is mainly distributed in the northern and central regions with an altitude of less than1000m.The high fire risk is generally distributed around roads and tourist attractions.The area below 1000m above sea level is the main gathering place for the people of Hongya County.The artificial activities near the road are strong and the fire risk is relatively high.The medium fire danger zone is distributed throughout Hongya County,with a total area of 48175.16hm~2.The low fire danger zone and the extremely low fire danger zone are mainly distributed in the south with high altitude and steep slope.Based on the fire risk zoning,specific fire prevention measures are formulated for specific situations.Under normal circumstances,we must first do a good job in fire prevention publicity and establish a joint prevention system.Secondly,we must strengthen the construction of a full-time forest fire prevention team;during the holidays and during the Ching Ming Festival,we must improve the fire prevention capacity of the forest area.