urban coastal bathymetry

FEMA recently released┬átheir updated flood maps – Flood Insurance Rate Maps (FIRMs), and there has been some visualizations that attempt to illustrate the what our cities will look like as a result of this rise.

Zone maps are useful for policy making but flows on terrain is much more interesting than its boundary. To allow the complexity to come through I joined USGS’s GMTED from 2010 and NOAA’s bathymetry data recently released for storm surge research, and juxtapose that with U.S. Census Bureau’s Metropolitan Statistical Area (MSA) boundary indicating major urban areas.

The resulting imagery allows one gain a much wider perspective in understanding the relationship between urbanization, geomorphology, and potential impact caused sea level change.

- All blue and blue-green color is below current sea level and color shows depth.
- Red zone is from current sea level to 1 meter.
- Orange zone is 1 to 5 meters.
- Above 5 meter is shown as grey scale. dark grey is low elevation and light grey is high elevation.

Both red and orange zones represent areas that are currently subject to storm surge events and future sea level rise. Hatched areas are metropolitans defined by Census – Metropolitan Statistical Area (MSA).

BayArea
Florida
Georgia
Maine
MidAtlanticBathymetry
NewEngland
NewOrleans
NorthWest
NY-Philly
SoCal
VirginiaBeachNC

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