Network Examples Distance to schools in Gambia Puerto Rico Streams Determine water availability for Nuclear Reactors in Russia Invasive fish moving “up.

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Presentation transcript:

Network Examples Distance to schools in Gambia Puerto Rico Streams Determine water availability for Nuclear Reactors in Russia Invasive fish moving “up stream”

Gambia

“Hydrology”/Stream Paths Fill Sinks Find direction Find Accumulation SetNull(“Accumulation”<Desired, ”Accumulation”) Stream Feature Make a network?

Fill Sinks

Direction

Flow Accumulation

Null Non-Stream Pixels SetNull("Accumulation"<10000,"Accumul ation")

Stream To Feature

What happened here?

Goes “straight” through lakes

A stream network?

Puerto Rico Streams

Missed Connections

Be Careful with “Near”

Islands and Channels

Natural Earth: Oregon

Stream Ordering

Stream Order

Gauge & Tidal Stations Gauge Data: USGS –Flow at a point on a stream/river Tidal Stations: NOAA –Tide and/or current at a location

Hydrologic Unit Codes (HUCs)

Hydrologic Unit Codes

Sub-Catchments

Lakes

National Hydrography Dataset NHD

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?

HEC-RAS

Hydrologic Flow