National Hydrography Dataset Plus High Resolution Data Model v.2.1

NHDPlus HR National data products are a seamless national aggregation of the most current NHDPlus HR Vector Processing Unit (VPU) products. The NHDPlus HR National Data Model is simplified to include a subset of the vector data contents in the NHDPlus HR Vector Processing Unit (VPU) Data Model, plus national feature classes (NHDPlusBoundaryUnit and NHDPlusGage) that are not included in the VPU Data Model.

NHDPlus HR National Data Model is used in two products:

1. NHDPlus HR National Staged Product (Esri File Geodatabase/OGC GeoPackage)
2. NHDPlus_HR Map Service

Note: In this data model, some NHDPlus HR information available in data tables in the NHDPlus HR Vector Processing Unit (VPU) Data Model have been joined directly to the hydrography features. Example: the NHDPlusFlowlineVAA and NHDPlusEROMMA tables have been joined to the NetworkNHDFlowline feature class. See the details of all joins identified in the feature classes below. Also note that NHDFlowline has been split into two feature classes, NetworkNHDFlowline and NonNetworkNHDFlowline.