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Geospatial capabilities for a BEST MANAGED Georgia
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Georgia Geospatial Advisory Council (GGAC)
Business Case for Accurate Digital Elevation Data Acquisition for Georgia
Prepared by the Georgia Geospatial Advisory Council (GGAC)Danielle Ayan, GISP, Chair | [email protected] 08.19.10
Geospatial capabilities for a BEST MANAGED Georgia
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Business Needs for Elevation Data
90% of all U.S. natural disasters involve flooding*
Floodplain mapping, the basis for assessing risk and Digital Flood Insurance Rate Maps (DFIRMS), is based on elevation data
~25% of annual flood insurance program claims are on properties outside the official flood zone
*https://www.gema.ga.gov/ohsgemaweb.nsf/a29ce156b1dc53e1852571180043368a/ca018a4dfa10633b8525711700799152?OpenDocument
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Business Needs for Elevation Data
GA avg flood insurance rates:o $616/yr for properties in the flood zone;
$333 for properties outside the flood zone As estimated 2,000 people in Austell lost their homes
or sustained significant damage in September’s flood. But only 60 flood insurance policies were in force on Austell properties, federal data show.
*https://www.gema.ga.gov/ohsgemaweb.nsf/a29ce156b1dc53e1852571180043368a/ca018a4dfa10633b8525711700799152?OpenDocument
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Business Needs for Elevation Data
Properties that lie within the official flood hazard area having federally backed mortgages are required to have flood insurance.
66 communities across Georgia, most of them small cities outside the metro area, are not in the National Flood Insurance Program (NFIP)
X
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Business Needs for Elevation Data
FEMA moving to the Watershed Approach to prioritizing risk (needs elevation)
Floodplain mappingo Digital elevation mapping is basis for floodplain
engineering analysis
o Computed water surface elevations are mapped onto the digital elevation surface yielding floodplain study results (both riverine and coastal)
o [Insert picture/video]
o Directly impacts the Digital Flood Insurance Rate Maps (DFIRMS)
Geospatial capabilities for a BEST MANAGED Georgia
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Other Location Information Impacting Flooding
Location factors affecting Floodplain mapping and floodingo Development
o LandUse
o Pervious/impervious surfaces
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Functions Served by Elevation Data
Economic Development Environmental Protection Flood Determination Fire protection
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Existing Elevation Data for Georgia
Inconsistento Coastal GA: 2010 | Xm resolution |
o Rest of the state: 10-meter National Elevation Dataset | [date] []
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Economy-of-Scale: Case Study
Coastal Georgia Elevation Project (CGEP)o USGS + NOAA + DNR CRD + CGRC +
Local Govts
o 1-foot accuracy
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Why Does Geospatial Matter ? U.S. Department of Labor has identified Geospatial
Technology as a High Growth Industry: http://www.doleta.gov/Brg/Indprof/geospatial_profile.cfm
Detailed data about government programs, and geospatial visualization of that data, can provide a clarifying vision for action where action is needed most.
According to the National Association of State Chief Information Officers (NASCIO), geospatial capabilities represent “a portfolio of capabilities that extends across the enterprise. The investment in this portfolio is growing … in every aspect of government decision making.”*
* National Association of State Chief Information Officers (NASCIO), “Governance of Geospatial Resources: Where’s the Data? Show Me’ – Maximizing Investment in State Geospatial Resources.” July 2008:http://www.nascio.org/newsroom/pressReleases/080723.cfm
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Conundrum Federal government maps predict in parcel-by-parcel
detail where the water will travel when a megastorm hits
Not all Georgia counties have digital parcel data
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Links AJC Flood Map: http://www.ajc.com/news/damage-exceeds-flood-map-147324.html
See Chris Diller ($7M from Housing Dept for LiDAR due to flooding)
WI: http://news.sco.wisc.edu/news/state-land-information/wisconsin-department-of-commerce-lidar-grants-announced.html
http://news.sco.wisc.edu/news/state-land-information/more-lidar-coming-to-wisconsin-in-2010.html
http://www.nap.edu/openbook.php?record_id=12573
OH LiDAR: http://pwmag.com/industry-news.asp?sectionID=760&articleID=1383919
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ContactQuestions/comments should be directed to the Georgia
Geospatial Advisory Council (GGAC) Chair: