摘要
针对全国农用地分等项目中省级汇总工作的需要,该文提出把县级分等单元转化成点,对其按六项属性指标进行集簇,同簇点可视化颜色相同,不同簇点颜色对比明显,把簇点及县级分等单元层的比例尺及地图投影转化成与省级汇总单元层的相同形式,再进行叠置,然后采用肩联移动簇点、概括聚集分布型县级分等单元外围轮廓、增添县级分等单元、逻辑归并零星簇点、夸大零星分布面积较小的县分等单元图形、分割含异簇点省级汇总单元六种策略,以保证每个簇点都被唯一地归属到省级汇总单元中,而且要求每个省级汇总单元所包含的簇点具有同簇性,在此基础上,采用GIS平台自动建立省级汇总单元与县级分等单元对应关系表。理论分析与实践表明,所提方法与策略能提高农用地分等省级汇总效率与成果精度。
According to the provincial summarizing demands of farmland classification,based on changing county units into points,classifying the points by poly-attributes,displaying the same class points with the same color but sharply distinct from the different ones,overlapping the points and county units layer with provincial units layer after transforming the scale and the map projection,the six kinds of methods are proposed.The first is moving the points into provincial units intersecting with the county units,the second is generalizing the outlines of the county units distributing in a cluster form,the third is that the county units with large area and not intersecting with any provincial unit act as provincial ones,the fourth is moving the points belonging to county units with a small area into provincial units including the same kind of points as the point,the fifth is exaggerating the county units with small area,the last is dividing provincial units including more than one kind of points,Each point was only belonging to the unique provincial unit and the same attributes also for the points in one provincial unit contained.Meanwhile,GIS was used to construct relation table automatically between provincial units and county ones.Theoretical analysis and practice indicated that the method mentioned in the article was able to improve the efficiency and the precision of the provincial summarizing of farmland classification.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2008年第S1期145-148,共4页
Transactions of the Chinese Society of Agricultural Engineering
基金
国土资源部农用地分等项目
关键词
县级分等单元
省级汇总单元
多属性集簇
自然等
利用等
经济等
county unit
provincial unit
poly-attributes classification
natural grade
utilization grade
economic grade
