Preserved Digital Content: Value to Public Policy Decision Making Now and in the Future NC Geospatial Data Archiving Project (NCGDAP) North Carolina State University Libraries North Carolina Center for Geographic Information & Analysis Presented by:Steve Morris Head of Digital Library Initiatives NCSU Libraries NSDAB MeetingJuly 24, 2007
96 of 100 North Carolina Counties have GIS systems as do many municipalities Over 30 state agency data producers Collection Focus: State and Local Government Geospatial Data Exceptional value –Detailed, current, accurate Exceptional risk –Inconsistent or nonexistent archiving practices –Complicated formats and complex objects Source: NC OneMap
Carrboro, NC : Population 17,797 (2005 est.) 22 downloadable GIS data layers 3 OGC WMS services (web services) 10 web mapping applications 9 downloadable PDF map layers
NCGDAP Data Types – Digital Orthophotography All 100 NC counties with orthos 1-5 flight years per county gb per flight
NCGDAP Data Types – Raster to Vector 1.) GIS-ready Image Data County Orthorectified Aerial Photography 3.) GIS Layers Impervious Surfaces, Landcover Tree Type, Urban Green Space, etc 2.) Feature Extraction Semi-automated Feature Extraction: Uses Spatial Context, Image Texture, Multiple layers of data, Existing GIS layers
NCGDAP Data Types – Vector GIS Cadastral (tax parcels) Street centerlines Zoning Topographic contours School, sheriff, fire Voting precincts More … Detailed, accurate, current Frequently updated
NCGDAP Data Types – Other (now and future) Remote sensing: e.g. LIDAR data Digital cartographic products: files Digital cartographic products: web services Place-based data
Value in Older Data: Solving Business Problems Suburban Development 1993/2002 Near Mecklenburg-Cabarrus County border Land use change analysis Real estate trends analysis Site location analysis Disaster response Resolution of legal challengesImpervious surface maps
Problem: Flood and Hurricane Preparedness
Application: Impervious Surface Change Mapping A.B. C. D Impervious 2004 Aerial Photography 2004 Impervious using 2002 Mask 2004 Impervious Update
Problem: Beach Erosion and Shoreline Change
Application: Shoreline Change Mapping
Problem: Tracking Land Use Change
Application: Land Use Change Mapping Input Data Output GIS Data Using Mecklenburg County 2002 true color orthorectified aerial photography Developing Areas
NC Geospatial Data Archiving Project (NCGDAP) Partnering with Spatial Data Infrastructure (SDI) to temporally enable geospatial work