Can you use NHDinARC in ArcMap?
Yes. Do the relates used in NHDinARC work in ArcMap? The relates that are distributed with the NHDinARC data were developed for application in ArcInfo Workstation. Unfortunately these relates are not applicable in ArcMap. ArcMap, however, does provide capabilities to link to related tables. For the labeling application that you mention below, probably the best bet in ArcMap would be to use a table join. Load the route.drain subclass into your ArcMap session and right click on the layer. Select Join… In the form that appears, enter RCH_COM_ID in #1, route.rch in #2, and COM_ID in #3. This join will provide access to the route.rch attributes from the route.drain layer. If you choose to label the drains, choose the route.rch:NAME attribute for the label. Although this labeling application is just one example, the NHD data contains multiple identifier cross references to link associated tables. Can the NHD be reprojected? The NHD data are not projected. It is in geographic coordinates (u
