#获得唯一值 by gisoracle def getuniqueValue(inTable,inField): rows = arcpy.da.SearchCursor(inTable,[inField]) # Create an empty list uniqueList = [] try: for row in rows: v=row[0] # If the value is not already in the list, append it if v not in uniqueList
最近工作上需要用ArcGIS API for Javascript来开发一个浏览器上使用的地图编辑工具,分享一下一些相关的开发经验. 我开发的地图编辑工具是根据ESRI提供的例子修改而来的,参考的例子是https://developers.arcgis.com/en/javascript/jssamples/ed_default_editingwidget.html 我们下面只说一些需要注意的问题: 1.代理的问题 Java Script API是基于REST访问的,通过GET的方式请求数据,这
流向地图火了,因为Facebook的那张著名的友邻图,抑或因为<数据可视化之美>中介绍飞行模式的航线图,总之,流向地图以它特殊的可视化形式,直观地展示事物之间的联系,尤其在展示网络流向.贸易流向.迁徙路线等方面具有天然的优势. Flow maps - show the movement of some phenomenon, normally goods or people, from one place to another. Lines are used to symbolize the
In this topic About using environment settings Environment settings summary table About using environment settings Each tool has a set of parameters it uses to execute an operation. Some of these parameters are common among all tools, such as a toler