ArcGIS采用D8算法计算水流方向(9.3.1后新增),输入数据应首先完成了洼地填充处理: One of the keys to deriving hydrologic characteristics about a surface is the ability to determine the direction of flow from every cell in the raster. This is done with the Flow Direction function. This
现象: 前端采用Openlayers,更新Feature时服务器端返回的XML提示更新错误 原因: 参考:http://support.esri.com/en/knowledgebase/techarticles/detail/42335 这是ArcGis的Bug 解决方法: 将Oracle数据库中ArcGis生成的索引删掉,如 DROP INDEX A29_IX1