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My name is Joel Skalet, I am the NHD Point of Contact
(POC) for Region 3. I will be discussing today finding
events on the network. I will first be describing
finding events by Select by Location. In doing so you
will be finding stream gages upstream of a specific
starting point on a flow network. By selecting by
location you can navigate upstream of that certain
point. In the following slide, you Select by Location.
Selecting features from a specific layer, in this case
Blue_All Events, that intersect the NHD flowline. In
the next slide you will see the stream gages that are
detected along that flowline network. Next I will be
finding events by Select by Attribute. I will create
a relationship using the flowline and event tables
based on the ReachCode. Inside the circle you can see
that ReachCode is selected with NHD flowline and then
at the bottom you do create a filename. We use that
Select by Attribute to invoke the relationship. In the
flowline table, click on the Options button in the
lower right, go to Related Tables and then you will
see the stream gage relate Blue_All_Features. You will
notice that the link between the ReachCodes in both
tables, shows that the stream gages are detected. In
the following slide you will see these stream gages
highlighted along that network. In the next slide we
will be finding events using the flow table. By
building the flow network we find stream gages
upstream of a starting point. You will see that
through the sequence we are using the flow table
through to the flowline table and down to the
attributes of in this case the Blue_All Events table.
You can see the connection from the ComID in the flow
table to the ComID in the flowline table that relates
then to the ReachCode which then relates to the
ReachCodes in the attributes of Blue_All Events. In
the following slide you will see another example of
that. And in the final slide you will see that we can
find stream gages upstream of that starting point
using the flow table. So you see by using the Select
by Location tool, the Select by Attribute tool, and by
using the flow table and building a flow network you
can use the NHD to find events along a network to be
used in analysis. Thank you.
Title: Finding Events on the NHD Network
Description of how to find events on the National Hydrography Dataset (NHD) network for analysis and modeling purposes.
Date Taken: 9/1/2011
Video Producer: Kristiana Elite , U.S. Geological Survey, National Geospatial Technical Operations Center (NGTOC), National Hydrography Dataset
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Additional Video Credits:
U.S. Geological Survey
National Geospatial Technical Operations Center (NGTOC)
National Hydrography Dataset
For more information go to: National Hydrography Dataset
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