Spatial overlap analysis of regional diversity of agro - economic sustainable development in fujian province 福建农业经济可持续发展区域差异的空间叠置分析
3 . when database was built , taking land resource unit as geographical unit for watershed data integration , we analyzed in piles land resource unit map and single element map layer of every evaluation factor , acquired attribute data through manipulation on attribution file of produced map layer 流域数据建库时以土地资源单元作为流域数据集成的地理单元,将土地资源单元图与各个评价因子的单要素图层分别进行叠置分析,通过对各生成图层的属性文件进行操作来获取属性数据。
So it can better isoline draw process for analyzing mineralization result and groundwater hydrochemistry law of anion , cation distribution , it can also design and carry out superposing analysis function and use superposing method draw zone figure of hydrochemistry type . moreover , the system of secondary development has function that stores ultimate figure result into spatial database , it is not steady but flexible at any moment , it can so discretionarily superpose together with other figure layers that it forms synthesis figure set of multi - layer superposing and complicated content for the zone supplying accessorial support 该系统在完成了基本数据管理、图形显示及查询功能之外,还实现了等值线生成功能,大大简化了过去为分析矿化度、阴、阳离子分布等水化学规律而作的等值线绘制工作;该系统还设计实现了叠置分析功能,用于在等值线绘制功能的基础上,通过叠置分析的方法绘制出水化学类型分区图。