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:
https://pubs.usgs.gov/tm/11/b11/tm11b11.pdf

link to resource page:
https://www.usgs.gov/core-science-systems/ngp/ss/elevation-derived-hydrography-specifications

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