network examples distance to schools in gambia puerto rico streams determine water availability for...
TRANSCRIPT
![Page 1: Network Examples Distance to schools in Gambia Puerto Rico Streams Determine water availability for Nuclear Reactors in Russia Invasive fish moving “up](https://reader035.vdocument.in/reader035/viewer/2022070402/56649f255503460f94c3c5f6/html5/thumbnails/1.jpg)
Network Examples
• Distance to schools in Gambia
• Puerto Rico Streams
• Determine water availability for Nuclear Reactors in Russia
• Invasive fish moving “up stream”
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Gambia
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“Hydrology”/Stream Paths
• Fill Sinks
• Find direction
• Find Accumulation
• SetNull(“Accumulation”<Desired, ”Accumulation”)
• Stream Feature
• Make a network?
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Fill Sinks
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Direction
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Flow Accumulation
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Null Non-Stream Pixels
• SetNull("Accumulation"<10000,"Accumulation")
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Stream To Feature
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What happened here?
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Goes “straight” through lakes
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A stream network?
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Puerto Rico Streams
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Missed Connections
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Be Careful with “Near”
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Islands and Channels
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Natural Earth: Oregon
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Stream Ordering
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Stream Order
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Gauge & Tidal Stations
• Gauge Data: USGS– Flow at a point on a stream/river
• Tidal Stations: NOAA– Tide and/or current at a location
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Hydrologic Unit Codes (HUCs)
http://water.usgs.gov/GIS/regions.html
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Hydrologic Unit Codes
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Sub-Catchments
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Lakes
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National Hydrography Dataset
• NHD
http://nhd.usgs.gov/
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Next Steps?
• Create a stream network– Combine streams from multiple rasters– Compare the accumulated pixels to gauge
station measurements
• Create watershed– Point along the stream can be a “pour” point
• Create lakes?– Constant elevation above the “pour” point
• Get other software?
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HEC-RAS
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Hydrologic Flow