【作者】 周芳；

【导师】 盖艾鸿；

【作者基本信息】 甘肃农业大学 ， 土壤学， 2007， 硕士

【摘要】 本文以地理信息系统技术为基础,以定西市城市规划区为例,对农用地定级进行了研究。研究结果表明:1定西市城市规划区内118.45km~2农用地分为4级。其中,Ⅰ级地为25.47km~2,占总面积的21.50%;Ⅱ级地为38.65km~2,占总面积的32.63%;Ⅲ级地为44.07km~2,占总面积的37.21%;Ⅳ级地为10.26km~2,占总面积的8.66%。2从市区中心向四周农用地级别呈降低的趋势。在凤翔镇附近的柏林村、东河村、福台村、中川村内的部分农用地多为Ⅰ级地。康家庄村和石坪村内土地级别整体最低。Ⅱ级地连续分布在Ⅰ级地外围。Ⅲ、Ⅳ级地连续于Ⅱ级地外围分布。农用地级别受城市中心、交通条件和阻隔地物的影响显著。在铁路和高速公路东侧的巉口村、三十里铺村、北二十里铺村、石坪村等村的部分土地级别明显低于西侧的土地级别。3土地的分布呈相互交错的态势,高级别土地中分布有局部面积少低级别的土地,低级别土地中也有局部面积少高级别土地的分布。在未来一定时期内,Ⅰ、Ⅲ、Ⅳ级农用地质量会相对稳定,Ⅱ级农用地质量随着区域发展会有较大的提高,个别区域甚至会升级至Ⅰ级地,高级别土地面积将有所扩大,低级别土地面积将有所减少。4 GIS构建的数据库实现了图形库与属性库的互访,便于成果的分析和查询;并且在研究中建立起来的土地资源数据库,可以通过遥感资料和各种监测数据及时进行数据更新,从而获得变化了的土地资源信息和专题图件。5以GIS为技术基础,利用其强大的空间分析、图件绘制和数据处理功能,可以节约人力、物力、财力,加快了工作进度,提高了成果精度;并且基于GIS的农用地定级可以保存所有原始资料、中间及最终成果,便于成果的修订和更新。最后,文章还探讨了实证研究中遇到的问题,提出以下建议:第一,建立专家知识库、模型库,使因素因子的权重接近其真实权重;第二,针对级别分界点确定难度较大的情况,需选用聚类分析法、离差极值模型等方法,保证划分结果的客观性;第三,定级成果精度宜高不宜低,便于应用。更多还原

【Abstract】 Just in this context, this paper,utilizing Geographical Information System as a technical foundation and taking planning area of Dingxi City as an example, studied on the method of farmland grading.The study showed that:1 The 118.45km~2 farmland in planning area of Dingxi City is divided into 4 grades.First grade is 25.47km~2,and takes up 21.50% of the total area;Second grade is 38.65%km~2,and takes up 32.63% of the total area;Third grade is 44.07km~2,and takes up 37.21% of the total area;Fourth grade is 10.26km~2,and takes up 8.66% of the total area.2 From the urban center to the surrounding,farmland level is decreasing.Most farmland of Bolin、Donghe、Futai、Zhongchuan is first grade,the farmland level of Kangjiazhuang and Shiping is the lowest.The second grade continuous distributes first grade external.The third grade and fourth grade continuous distribute second grade external.City center、traffic conditions and obstructions affect farmland grade.In the east of railway and highroad,the farmland grade of Chankou、Sanshilipu、Beiershilipu、Shiping is lower.3 In higher farmland grade,there is some lower farmland grade.Meanwhile,in lower farmland grade,there is some higher farmland grade.In the future,first grade、third grade and fourth grade will be relatively stable.With the development of Dingxi,the second grade will be greater improvement,and individual regions will upgrade to first grade.High-level farmland area will be expanded,low-level farmland area will be reduced.4 That is the database that GIS has set up realizes the exchange visits of graph database and property database, so that it is convenient for analyzing and inquiring into the achievement.5 Taking GIS as technical foundation and using its ability of space analysis and data processing can save the manpower, material resources and financial capacity,accelerate the work plan, also increase the achievement precision; the farmland grading achievement based on GIS can conserve all original data as well as intermediate and end achievement that makes it convenient to revise and renew the achievement.Finally, this paper discussed the questions encountered in the practical test study, and put forward the following suggestion:Firstly, establishing expert system and some models, make grading factors′weight of farmland is close to their true data; Secondly, in accordance with the situation that the differences in defining of farmland grading, we need to use models of cluster analysis so that the result is objective; Thirdly, the precision of farmland grading achievement is suitable for high but not low, so that it is easy to apply.更多还原