GIS导论ch07.pptx

CHAPTER 7 SPATIAL DATA EDITING空间数据编辑;7.1 Location Errors 定位错误 7.1.1 Location Errors Using Secondary Data Sources 使用二手数据源定位错误 7.1.2 Causes for Digitizing Errors 数字化错误原因 7.1.3 Location Errors Using Primary Data Sources 使用第一手数据源定位错误 7.2 Spatial Data Accuracy Standards 精确度标准 7.3 Topological Errors 拓扑错误 7.3.1 Topological Errors with Geometric Features 几何要素拓扑错误 7.3.2 Topological Errors Between Layers 图层之间拓扑错误 ;7.4 Topological Editing 拓扑编辑 7.4.1 Topological Editing on Coverages 对Coverages拓扑编辑 7.4.2 Editing Using Map Topology 用地图拓扑编辑 7.4.3 Editing Using Topology Rules 用拓扑规则编辑 7.5 Nontopological Editing 非拓扑编辑 7.5.1 Editing Existing Features 编辑现有要素 7.5.2 Creating Features from Existing Features 由现有要素创建新要素 7.6 Other Editing Operations 其他编辑操作 7.6.1 Edgematching 图幅拼接 7.6.2 Line Simplification and Smoothing 线简化与平滑 ;Location Errors 定位错误 Location errors refer to the geometric inaccuracies of digitized features. 定位错误是指数字化要素的几何错误。 Location errors can be examined by referring to the data source for digitizing. 可以通过比对数字化数据源检查定位错误。;Figure 7.1 Common types of digitizing errors from tracing. The thin lines are lines on the source map, and the thick lines are lines from tracing. 图7.1 常见的跟踪数字化错误类型。细线为原数据，粗线为数字化数据。;Spatial Data Accuracy Standards 空间数据精确度标准 U.S. National Map Accuracy Standard, revised and adopted in 1947 美国国家制图准确度标准 Accuracy standards for large-scale maps proposed by the American Society for Photogrammetry and Remote Sensing in 1990 美国摄影测量和遥感学会公布了大比例尺地图的准确度标准。 National Standard for Spatial Data Accuracy established by the Federal Geographic Data Committee in 1998 联邦地理数据委员会制定了空间数据准确度国标。;Topological Errors 拓扑错误 Topological errors violate the topological relationships either required by a GIS package or defined by the user. 拓扑错误可影响GIS软件必需的或用户自定义的拓扑关系。;Types of Topological Errors 拓扑错误的类型 Topological errors with geometric features: undershoot, overshoot, dangling node, pseudo node, direction error, label error 几何要素的拓扑错误