County Level Farming Quality Appraisal System Software Development Research

The farmland is an agrarian essence,is the important production data that the agriculture production can't act for,is keep social can keep on a development with national economy of important resources.Therefore,protection farmland is our country of basic national policies,control amount,quality and its variety circumstance of farmland resources for the reasonable programming and make use of farmland in time,the practical protection farmland contains very important meaning.The geographical information system(GIS) is a ground of learn with calculator science of cross an output newly arisen academics,apply geographical information system(GIS) at the agriculture,work out problems,such as actual agriculture programming decision,technique expansion and land management...etc..Along with the technical development of the calculator and the information,geography information system's managing realm in the land has already get extensively applied, most lands manage sections all or many or littlely applied GIS,consumedly raised a work efficiency,but only is the editor which carries on the most basic information search,change,statistics and diagram piece,modify to the GIS application,output etc. operation.Combine the characteristics of evaluation of the farmland quality and request for the function raised a GIS technique in the farmland quality the evaluation, this theories,method,technique which studies to make use of geography information system,,build up farmland quality an evaluation system,this is to carry out a farmland quality's evaluation can see to turn,expand GIS application realm and satisfy the evaluation work of the farmland quality the demand of the modernization.This text according to to domestic and international relevant agriculture top the land make use of a management an information a management system,decision support system,expert system...etc,of research,combine database technique and GIS two development techniques,according to farmland quality evaluation of model and method,aim at the actual circumstance of county area,adopt Visual Basic 6.0 with ADO integrated development the technique carry on development and manage to the attribute database;Choose to use AreGIS Engine and Visual Basic 6.0 integration the development technique carry on a development and manage to the space database and built up to evaluate system according to the GIS the county class farmland quality.That system has a strong space data a processing and analytical function,can not only successfully support the evaluation process of the whole farmland quality and can see space of turn the soil nutrient and farmland grade to distribute,but also can acquire the information of the deep time of evaluation area;Mathematical Statistics science and expert's knowledge combine together to select by examinations three review the method of factor,not only avoided the machine of pure adoption mathematics method,but also reduced pure depend an expert experience knowledge the subjective bring.The system main mold piece is as follows:1,The GIS sketch data information manages a mold piece.Provide the importation of attribute data and edit,browse,delete function.Provide the importation order,the function of line,noodles sketch;Change the function of the style of order of privately owned,line,noodles sketch;The deletion order,the function of line,noodles sketch;Provide lately function of setting up,open,keeping the chart;Provide to enlarge,contract,travel extensively,recover the function that etc.sees a diagram operation;Provide to select to choose,the rectangle choice,circular choose the function which chooses with polygon choice etc.sketch.2,The farmland quality evaluates a mold piece an origin mold a piece.The main function withdraws main composition to the attribute data,the data which passes to belong to function to carry on standardize to the main composition data combines the combination power heavy calculation farmland that the layer analysis beg to produce function comprehensive index number.Finally according to the farmland produce function comprehensive index number to the farmland carry on cent wait settle class.