Geospatial Data - 36 of 35

Geospatial Data FAQs - 35 Found



What sources were used to produce the National Hydrography Dataset (NHD)?

It's a combination of USGS hydrologic digital line graph files and EPA reach files, version 3.0 (RF3). The USGS files are used for spatial accuracy and the EPA files are used for attribute information.


Tags: Datasets, Maps, Water, Geospatial, Data, Hydrography