NC Floodplain Mapping Program Highlights (preliminary observations) -Large number of data producers...

NC Floodplain Mapping ProgramNC Floodplain Mapping Program

• Highlights (preliminary observations)- Large number of data producers- Handful of 1st generation delivery orders in progress- All agree to supply data for flood mapping- Actual data formats, projection, & datum will vary- All data not necessarily off-the shelf but are derivable- Previous two observations will be challenges for

efficient base mapping collection process

GIS Data Availability SurveyGIS Data Availability Survey


• Highlights (observed comments/issues)– Use local tiling schemes (example: 1”=400’

scale, 10k x 10k tile for base map)– Use English units of measurement– Give ample time to prepare data for CGIA



• Survey Background– Primarily based on 1997 state-wide county

survey conducted by SGUC/NCDOT and the NSGIC/SMAC NSDI Framework Data Survey

– Involves input from the Statewide Mapping Advisory Committee (SMAC)

– Mailed to counties and municipalities in the 6 eastern river basins



• Survey process . . – Use and update existing Framework Data

contacts database (115 reps statewide)– Call contacts once scoping meeting is

scheduled– Fax or email survey instrument– Schedule appointment with contact – Determine if other local contacts exist



• Survey Specifics– Comprehensive – asks detailed questions about

hardware, software, data distribution, and related policy

– Contains specific questions for base map data layers (county boundaries, orthophotography, hydrography, etc.)

– Survey responses are input into a computer program tool…


NC Floodplain Mapping ProgramNC Floodplain Mapping ProgramNC Floodplain Mapping ProgramNC Floodplain Mapping Program

Computer program designed to store survey information


• Computer Program Background– Developed by Dewberry & Davis

LLC– Created as a way to log survey

responses in a computer database– Stores data in Microsoft Access– Format and questions are identical

to mailed survey


Some results from the Some results from the survey…survey…


Survey Status - CountiesSurvey Status - Counties


Orthophotography StatusOrthophotography Status


Transportation StatusTransportation Status


Cadastral StatusCadastral Status


Surface Waters Status


Elevation StatusElevation Status


Survey Status - MunicipalitiesSurvey Status - Municipalities

BurlingtonCarrboroChapel HillElizabethtownGarnerGrahamJacksonvilleKnightdaleMorrisvilleNorth Topsail Beach

PrincevilleRocky MountRolesvilleTarboroWake ForestZebulon

Camp Lejeune


Next Steps

• Complete surveys for 6 basins – Jan 31

• Enter all results into database – Jan 31

• Showcase results– Web Map/Data Site, Reports, Other?

• Survey 11 remaining basins – June 30


GIS Survey Scoping Team

Jeff BrownDavid GiordanoTim JohnsonZsolt NagyKen ShafferTom Tribble

Terry EllisForrest RobsonBill MillerRob AllenSteve MorrisJames SanbornSue Hoegberg

NC Floodplain Mapping Program Highlights (preliminary observations) -Large number of data producers...

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