Leveraging Public GIS Data for Floodplain Mapping and … · Floodplain Mapping and Situational...
Transcript of Leveraging Public GIS Data for Floodplain Mapping and … · Floodplain Mapping and Situational...
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Leveraging Public GIS Data for Floodplain Mapping and Situational AwarenessMichael Couch, GISP, CFM – Meshek & Associates, LLC
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An Ever Expanding List Of Options
With the proliferation of the Internet, there is now a website (or a thousand) for every need or interest
➜ But what’s authoritative data? Where is it?
➜ How is an FPA or EM to know which to use?
➜ In an emergency, we can wind up rotating through a list of bookmarks that looks a littlelike this:
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FEMA Mapping – National Flood Hazard Layer Viewer
Just Google “FEMA National Flood Hazard Layer Viewer” or jot this address down:https://www.arcgis.com/a pps /w eba ppview er/index.html?id=8b0a db51996444d4879338b5529a a 9cd
For direct data downloads, there’s always the FEMA Map Service Center: https://msc.fema.gov/portal/advanceSearch
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What’s More Oklahoma-Sourced Than The Mesonet?
Mesonet Rainfallhttp://mesonet.org
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FEMA Mapping – ArcGIS Online
Just search for the “National Flood Hazard Layer”, then zoom in enough for the Flood Hazard Zones layer to render
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If You Just Have An ArcGIS Online Account…
Not “free”, but close. Just sign in at https://arcgis.comand start searching
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Look At What’s Available Without Desktop Licensing…
As federal agencies and Esri increase collaboration, more resources coming online (radar, precipitation, traffic, etc.)
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…And You Can Bring It Into Desktop Software, Too
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National Water Model
Time enabled (animated, if you just click “Play”) forecast of every stream* in the country* (NHD Medium-Res)
In ArcGIS Online, just search “National Water Model”
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National Water Model
You can also view the forecast “Anomalies” (above and below normal)
In “National Water Model” results, look for “Anomaly”
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Stream Gauges
You can view the status of stream gauges without leaving your GIS application (desktop or browser)
The “More Info” link opens the NWS hydrograph page
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StreamStatsYou may already know StreamStats(https://streamstats.usgs.gov/ss/)
Here you can delineate upstream watersheds and trace downstream flow paths
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Flow Tracing and Watershed Delineation in AGOL
But you can do some of this in ArcGIS Online, too (no credits used, either)
➜ Under any of your layers, click “Perform Analysis”, then expand “Find Locations” and see the “Create Watersheds” and “Trace Downstream” buttons
➜ You can use existing points or draw new points to use on the fly
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Updated Topo Availability -- Bookmarks
➜ For general project coverage area questions (“Is it covered yet”, “When will it be”, “W ha t gra de w ill it be”): https ://coa st.noa a .gov/inventory/
➜ For actual data downloads:○ OKMa ps (not fully up to da te , but tha t ma y be cha nging…)
https ://okma ps.org/ogi/sea rch.a spx○ NRCS Da ta Ga tew a y (good for pre-3DEP / 2-meter da ta , but w ith
dow nloa d limits ma king it likely you’ll need to dra w a n AOI): https ://da ta ga tew a y.nrcs .usda .gov/GDGOrder.a spx?order=iMa pOrder
○ But ma ybe bes t of a ll (especia lly into the future) is The Na tiona l Ma p: https ://view er.na tiona lma p.gov/ba s ic/
○ Current 3DEP s ta tus (1-meter), a cquired a nd underw a y:(OK: Green = 3DEP current or pla nned; W hite = 2-meter)
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