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moving to high-res nhd seminar
Moving to High Resolution
NHD Seminar
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The NHD, while originally based on 1:100,000-scale linework,
is designed to incorporate high-resolution data. USGS is
developing ArcInfo and ArcView based tools that will allow
partners to create NHD data using other sources of linework.
This workshop will provide an in-depth description of the
various steps in the process. Major steps include: pre-conflation,
which creates a watershed based, connected network with
arcs directed downstream and centerlines; conflation, which
transfers the appropriate information from the 1:100,000-scale
NHD; and post-conflation which validates the flow direction
attributes and creates all the necessary tables that are
part of the NHD. The tools will be demonstrated and examples
of interactive processes will be shown. Sorry, no hands
on data creation so don't bring your data and hope to leave
with a complete high-resolution NHD dataset.
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