摘要
测绘部门的地形图数据是以AutoCAD数据格式存储,不能够实现查询、检索,更不能够实现坡度计算、分析。而旅顺地区国土修编中需要把高程在60m以上以及坡度大于25°的耕地退耕还林。文章通过MapInfo、Verti-calMapper、MapBasic结合,实现栅格数据与矢量数据的互操作,提取需要退耕还林的耕地。
The data of topographic map in survey department is AutoCAD format. It can not achieve query and retrieval, slope calculating and analysis. The land compilation of Lvshun area need reduce cultivated land of elevation greater than 60 meters and slope greater than 25 degrees to forest and grass. The article achieves interoperability between raster and vector data and extracts area of reducing cultivated land to forest and grass by combining Maplnfo, Vertical Mapper and MapBasic.
出处
《测绘与空间地理信息》
2005年第5期74-77,共4页
Geomatics & Spatial Information Technology
基金
国家自然科学基金项目资助(40471011)
辽宁省教育厅高等学校科学研究项目资助(20042100)
关键词
矢栅转换
退耕还林
赋值技术
叠置分析
conversion between raster and vector
reduce cultivated land to forest and grass
assign technology
overlay analysis
