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ned-h stage 2 seminar
NED-H Stage 2 Seminar
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The National Elevation Dataset - Hydrologic (NED-H) derivative
dataset serves to integrate three of the USGS' datasets
- the National Elevation Dataset, the National Hydrography
Dataset and the Watershed Boundaries Dataset. The NED-H
is being developed in a three stage process. Stage 1 derives
hydrologic derivatives via a semi-automatic ARC/INFO process.
Stage 2 utilizes ArcView tools to create preliminary watersheds
and sub-watersheds and to identify and annotate discrepancies
between NED derived derivatives and the NHD or other datasets
used for verification. Stage 3 will use output data and
information from Stage 2 to develop a hydrologically conditioned
NED dataset that will subsequently be used to derive the
final NED-H hydrologic derivative dataset.
This seminar is concerned with the Stage 2 aspects of the
NED-H project. In Stage 2, NED-H participants lend their
local knowledge to the quality checking process, reviewing
the NED-H derived streamlines and drainage basins as well
as locating watershed and subwatershed outlet points. The
tools have been developed, and continue to be refined through
a CRADA with ESRI, to facilitate this work. This seminar
will summarize the status of the Stage 2 effort, present
the ARCVIEW tools currently being used by Stage 2 collaborators
across the country and discuss lessons learned by the on-going
participants.
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