Geospatial capabilities for a BEST MANAGED Georgia 1 Georgia Geospatial Advisory Council (GGAC)...

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


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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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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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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)

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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)


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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:

Geospatial capabilities for a BEST MANAGED Georgia 1 Georgia Geospatial Advisory Council (GGAC)...

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