Major_Watersheds_Phila
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View metadata for key information about this dataset. Data was developed originally from either USGS and the 2004 Sanborn DEM (digital elevation model) using ArcHydro watershed extraction tools. Major Watersheds are dissolved from subshed boundaries which reflect surface flow in relationship to stormwater inlets and outfalls. See also the related layer Major Watersheds - Regional. For questions about this dataset, contact raymond.pierdomenico@phila.gov. For technical assistance, email maps@phila.gov.
请查看元数据以获取该数据集的关键信息。该数据集最初由美国地质调查局（USGS）与2004年圣博恩数字高程模型（DEM，digital elevation model）结合ArcHydro流域提取工具开发完成。主流域（Major Watersheds）通过溶解子流域边界得到，这些边界反映了与雨水口及排放口相关的地表径流特征。另可参阅相关图层「主流域-区域版（Major Watersheds - Regional）」。若您对该数据集有任何疑问，请发送邮件至raymond.pierdomenico@phila.gov；如需技术支持，请发送邮件至maps@phila.gov。
