Research On The Division Of The County Soil Erosion Information Extraction Based On GIS And RS

Soil erosion is a proccedure of soil and its parent material which are destroyed,erosioned,transportation and deposition process in the hydro,wind,freezing and thawing or battalion force under the action of gravity thereof.Soil erosion is very complex,the process of different areas within the scope of the influence factors are different.As a result of the limitation of water conservation departments at the county level technical conditions,the soil erosion of governance management means relatively backward,the staff mainly through actual survey data for soil erosion,practical management has limitations.With the rapid development of remote sensing and GIS technology,the combination method to research and control of soil erosion were given more and more attention.In this paper,it is mainly done the following several aspects of the research and work based on remote sensing and GIS technology:(1)Application of High resolution remote sensing image for the vegetation coverage extraction.This article use the remote sensing image resolution of 2.5 m,in order to weaken the mountain complex terrain and slope to interfere with the accuracy of extracting vegetation coverage,using terrain orrection model terrain radiant correction of remote sensing image,through comparing found before and after the correction,terrain radiant correction of remote sensing image in the ridge,slope and shadow are improved well,improve the accuracy of the vegetation coverage.(2)Soil erosion RUSLE model each factor calculation method of the extraction.According to collect the relevant data,including meteorological data,soil type,land use data and remote sensing image,etc.,on the basis of the most widely used RUSLE model,the research is appropriate at the county level and the calculation method of soil erosion factor model factor consists of six parts:the soil corrosion factors,rainfall erosion force factor,vegetation coverage factor,slope factor,slope length factor and factor of soil and water conservation measures.(3)Semi-automatic information extraction system design.This paper,taking the GIS as technical means for the semi-automatic information extraction system design,the system designed for only staff input information extraction system url in any web browser,and select the relevant basic data.You can achieve the results of soil erosion manage queries with calling GP development tools released by factor calculation model service daemons use AO,get soil erosion grade map and upload it to the web.It can achieve query to obtain the result of the soil erosion and management,save the manpower and material resources of traditional soil erosion investigation and verification and time consumption,and high precision.Information extraction system is the basis of the data must first be for data preprocessing,so the process of soil erosion information extraction system is a semi-automated process.