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GIS支持下的龙海市耕地基准地价评估方法研究
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摘要
本文是在地理信息系统(GIS)支持下,以《农用地估价规程》为技术依据,以龙海市耕地资源为例,通过对不同技术方案所得出的地价结果的对比分析,确定合理的估价方法和基准地价。
     本文采用的技术流程如下:第一,在定级基础上,以定级单元为单位,在全市范围内选取代表性样点495个及标准田块119个。实地调查其投入产出资料,通过收益还原法计算样本地价,确定各技术方案(8种方法)的基准地价结果,并利用ARC/INFO和ARCVIEW建立对比分析数据库,实现属性与空间数据库的交互式查询。第二,确立一个合理的判断标准,在SPSS统计软件的支持下,对数学模型及技术方案进行对比分析,综合评价其与定级间的关系,确定出一个可行的方法,并最终确定耕地区片和级别基准地价。第三,分析地价与定级因子间的关系。
     分析结果表明:不同技术方案评估耕地基准地价的结果大致相同,也就是说不同方案的结果都可以认为是可行的。但就与定级间的联系程度上看,研究结果证明,三项式模型是最合理的,它通过建立地价与定级综合分值间的数学关系,更确切反映各级单元与地价的关系,能够作为龙海市耕地基准地价的结果。同时,在研究中也证实数学模型的选择也是相当关键的,级间总体趋于一致的模型,在其级别内也可能存在较大的差异(对数、乘幂模型等)。最后,通过对地价与定级因素的分析,结果表明农贸中心和土壤类型与地价有较高相关性,而田间道路的相关性则较差。
     目前我省在耕地基准地价评估上正处于探索阶段,之前没有形成一个完整的地价体系。本研究从龙海市的客观实际出发,对估价技术方案和数学模型进行对比分析,确定一个较为合理的方法以及地价与定级因子的关系模型,为健全我省地价体系提供科学参考。
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 of
    
    
    farming 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.
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