土地利用现状图缩编方法探讨

针对目前1∶1万比例尺较小的土地利用现状图比较缺乏和已有图件现势性不强等问题,以重庆市永川区土地利用现状图缩编工作为研究对象,就土地利用现状图由1∶1万缩编到1∶5万的缩编方法、原则、流程和综合取舍标准进行了探讨。结果表明,采用＂先编后缩＂的成图方法,在遵循丘陵区土地利用现状图由1∶1万缩编到1∶5万的缩编原则、流程和综合取舍标准基础上,图件成果在图斑数量保留、地类数据结构比例、美观效果等方面能较好地满足土地宏观管理的需要。

Discussion on Generalization Method of Current Land Use Map

The study focused on the generalization of land use map from 1∶10 000 scale to 1:50000 scale,using a case of Yongchuan in Chongqing.The principles,technological procedures and standards of the comprehensive choice of land-use map generalization were discussed.Finally,a generalization method was proposed which is composed of two steps:first,retaining big land-use patches and merging small patches into bigger ones based on the printed map;second,rescaling the revised map from 1∶10 000 to 1∶50 000 through GIS software.The results showed that the method of map generalization can help to improve the quality of generalized map in terms of the number of patches,the structure of land use types,and the visual output,and can further facilitate large-scale land-use management.