kind of hard to keep hating the state government now that I've learned that NH commissioned a LIDAR mapping of the entire state, with 2' altitude resolution, and put it all on the net with great front end search tools ... for free. https://granitview.unh.edu/
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Looks like the 2ft number is horizontal accuracy for GRANIT: https://www.granit.unh.edu/resourcelibrary/specialtopics/lidar/Status-May2019.png …
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The RMS elevation error for the USGS dataset is nominally 10cm, and 9.25 or 9.3cm for large parts (but not all) of NH, per the map.
End of conversation
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