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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:

Description of how to find events on the National Hydrography Dataset (NHD) network for analysis and modeling purposes.

Location: USA

Date Taken: 9/1/2011

Length: 3:24

Video Producer: Kristiana Elite , U.S. Geological Survey, National Geospatial Technical Operations Center (NGTOC), National Hydrography Dataset

Note: This video has been released into the public domain by the U.S. Geological Survey for use in its entirety. Some videos may contain pieces of copyrighted material. If you wish to use a portion of the video for any purpose, other than for resharing/reposting the video in its entirety, please contact the Video Producer/Videographer listed with this video. Please refer to the USGS Copyright section for how to credit this video.

Additional Video Credits:

U.S. Geological Survey

National Geospatial Technical Operations Center (NGTOC)

National Hydrography Dataset

Source:

For more information go to: National Hydrography Dataset

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Tags: Dataset Hydro NHD National NationalHydrographyDataset USGS hydrography resources water