Study On The Evaluation Methods Of The Basic Land Price Of Cultivated Land In LongHai Based On GIS

Based on the GIS , taking Procedures and Rules for Farmland Evaluation for technical base and taking land resource of Longhai City for an example, the paper ascertains a rational evaluation means and basic land price through contrastive analysis of land price resultant on different technical proposals.The paper's technological process as follows: First, selecting 495 sample plots and 119 standard fields within the city on the base of grade and at the units of grade cells. Surveying input and output data on the spot and ascertaining the base land price of each technical proposal(8 means) by calculating land price of sample plots with income reduction method. Building the database of contrastive analysis through ARC/INFO and ARCVIEW, and realizing interactive mode query of attribute and spatial database. Second, after making a rational acceptance and rejection criteria and based on the statistical software of SPSS, through constrastively analyzing mathematical model and technical proposal and overall meriting their relationship with grade, ascertaining a feasible means and region and grade basic land price of cultivated land ultimately. Third, analyzing the relationship between land price and grade factors.Analytic results show: the results of basic land price of cultivated land which were evaluated by different technical proposals are about and about, it's said that the different conceptual results can be assumed feasibly. But seeing from the connecting degree between them, the paper proved that the trinomial model is the most rational method, it can exactly reflect the relationship between grade cells and land price through building a mathematical relationship between land price and grade synthetical values, so it also can act as the result of basic land price of cultivated land for Longhai City, at the same time, the investigation confirms that the selection of mathematical models is quite pivotal, the grade totalities of the models approach identically, but it may have major difference(such as logarithm model and power model,etc) inside their grades. At last, through analyzing the relationship of land price and grade factors, the result shows that the trade center offarming and soil types have higher correlation with land price, whereas it has lower correlation between field path and land price.At present, our provincial basic land price evaluation of cultivated land is on the stage of probing, before it did not form a integrated land price system. The paper studies from the objective actuality of Longhai city, constrastively analyzing the appraisal technical proposals and mathematical models, ascertaining a much more rational means and relational model between land price and grade factors, and offering a scientific reference to strengthening land price system of our province.