Hi folks ..... The board asked about the USGS Elevation-Derived Specifications at their last meeting.   You may find it interesting too, so I am sending it along to everyone.  Happy Holidays! .....Dan

link to spec:

link to resource page:
Elevation-Derived Hydrography Specifications - USGS<https://www.usgs.gov/core-science-systems/ngp/ss/elevation-derived-hydrography-specifications>
The USGS provides specifications, READ Rules, and additional resources for the acquisition of elevation-derived hydrography (EDH) from distributed 3DEP products for inclusion in the National Hydrography Dataset.

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