💧🌏 Greg Cocks<p>Blow-Me-Down Brook, NH – An NHD Flowline Picked ‘Randomly’<br>--<br><a href="http://npshistory.com/brochures/saga/blow-me-down-na-1981.pdf" rel="nofollow noopener" target="_blank"><span class="invisible">http://</span><span class="ellipsis">npshistory.com/brochures/saga/</span><span class="invisible">blow-me-down-na-1981.pdf</span></a> <-- 1981 NPS guide<br>--<br><a href="https://www.usgs.gov/3d-hydrography-program" rel="nofollow noopener" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">usgs.gov/3d-hydrography-progra</span><span class="invisible">m</span></a> <-- USGS’s 3DHP home page<br>--<br>I am working on some hydroaddressing / network traversing technical approaches for 3DHP – and needed an example of a multisegment flowline in NHD-sourced dataset, and so ‘randomly’ got this one - Blow-Me-Down, NH, from WBD HUC4-0108.<br>Although we map so many flowlines (~20 million in the USA for NHD-sourced spatial data, estimated 10x that for the EDH data still to be determined across the USA), I like trying to understand what a flowline or waterbody ‘is’ to the people on the ground as much as I can...<br><a href="https://techhub.social/tags/GIS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GIS</span></a> <a href="https://techhub.social/tags/spatial" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>spatial</span></a> <a href="https://techhub.social/tags/mapping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mapping</span></a> <a href="https://techhub.social/tags/networktraversing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>networktraversing</span></a> <a href="https://techhub.social/tags/3DHP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>3DHP</span></a> <a href="https://techhub.social/tags/NHD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NHD</span></a> <a 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