North Carolina’s New Statewide Road Centerline Data Sarah Wray, GISP, CGCIOTim Sheldon, GISP Spatial Data ManagerBusiness Analyst Engineering Transportation Systems – GIS UnitTimmons Group

The New Statewide Centerline Data All public roads Authoritative sources: NCDOT Local governments One state schema Topologically correct including political boundary lines

Why, you ask? Various centerline maintenance across the state NCDOT maintains system route geometries Local Governments maintain geometries for both NCDOT system and Non-System routes Federal Reporting Requirements Source standardization for all federal agencies $$ Funding $$ Planning Support Strategic prioritization of projects

Currently Stove Pipe Data NCDOT Authoritative Data Local Government Authoritative Data Governments are willing to share, but that only goes part way

Schema and Topological Inconsistencies 101 Schemas 100 Local Government 1 NCDOT Statewide Topologies Internal to a source dataset Neighboring counties don’t necessarily have to connect centerlines at county boundaries NCDOT & Non-NCDOT maintained centerlines

Predecessors Local Government efforts ISRN Carbon Project

ISRN – November 2007 NCDOT Integrated Statewide Road Network Constructed from multiple sources 2005 TIGER County data Not maintained

Carbon Project – November 2012 Work by the Working Group for Roads and Transportation Exists to facilitate the sharing of roads data between regional planning organizations, local governments, state agencies, and the public. Web based schema mapping tool Allows registered local representatives to upload and schema-map their data NCDOT owns the translator Contains 82 of NC’s 100 counties of centerline data

Rome – September 2015 ?? NCDOT’s project to implement Esri’s Roads and Highways Linear Referencing Solution Upgraded enterprise LRS Centerline data for the Rome project began around September 2013 NCDOT sponsored Permanent Staff Contract staff Software Vendors

Rome Project Data Sources Local Governments From NCDOT data collection processes Data collected by an analyst at NCDOT approx. once every 6 months In place of Carbon Project to ensure data availability for project go- live NCDOT From NCDOT Production LRS as of 1/6/2015 LRS is currently frozen for maintenance pending Rome go-live

Rome Project High Level Methodology (Non-System) Research 100 local government schemas Data as collected by NCDOT process Evaluate Local Government Information Model (LGIM) Eligible to participate in Esri’s Community Maps program Necessary items to maximize usefulness of data Choose dominant items from 100 schemas and LGIM Created a data model to be used as a basis for migration

100 ETLs Created – Maintained by NCDOT

Rome Project High Level Methodology (System) NCDOT Source LRS Daily maintenance Downstream Business Continuity Legacy Routes Advanced Linear Referencing Minimum Schema Items from NCDOT LRS Routes Centerlines

Rome Data Model

NCDOT System & Non-System Integration Authoritative sources Remove non authoritative spatial overlaps Topology Connect NCDOT system with non-system Conflation Move desired attributes from non-system routes to system routes i.e. Street Name

NC One Centerline Conflation Process SQL Server database SQL Server database SQL Server database SQL Server database

Ongoing Maintenance G1FTSEG Legacy Reference Data NCDOT Data Conversion and Event Editors Daily update of system (NCDOT) centerlines Quarterly update of non-system centerlines Schedule and methodology pending completion of Rome project Local government centerlines may come from Carbon Project or through existing data collection efforts by NCDOT. Change detection process

How does the general public get the data? Publication Web Services as part of the Rome project Go!NC – NCDOT’s ArcGIS On Line implementation NCDOT Data Distribution Web Page Minimum quarterly

What’s Next for the Data What will NCDOT do with the data? Maintain as the enterprise LRS FHWA requirements What can other state agencies do with the data? Addressing as event data along the LRS Inclusion of State Park, Federal and Wildlife Resources Commission data What can local governments do with the data? Choose to consume as source data Addressing, public works

North Carolina’s New Statewide Road Centerline Data Sarah Wray, GISP, CGCIOTim Sheldon, GISP Spatial Data ManagerBusiness Analyst Engineering Transportation Systems – GIS UnitTimmons Group