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									         Creating a
Regional Routable Centerline
    in Northern Virginia

       Brendan Ford

         Fairfax County, Virginia
   VA established a state wide centerline file in
    early 2000’s.

   Fairfax County started project to replace
    Computer Aided Dispatch (CAD) System in

   VA Wireless Board promotes state grant
    applications in 2009.

                     Fairfax County, Virginia
               Fairfax CAD-GIS
   Initial GIS requirements gathering to support
    CAD started in 2005
   Extensive data model development to support
    CAD needs
    • Geoverifying and Routing in CAD
    • Closest Unit Dispatch
    • Mutual and Automatic Aid
          Requires data outside of Fairfax County
   October 4, 2009 – Live with Intergraph

                           Fairfax County, Virginia
                       State Grant
   VA Wireless E-911 Services Board PSAP Grant
    • Regional GIS data to support mutual aid routing
    • Support regional routing to support
      Phase II Wireless 911
   Key Players
    •   Arlington County
    •   City of Alexandria
    •   Fairfax County
    •   Loudoun County
    •   Prince William County
    •   State of Virginia – Virginia Information Technology Agency

                             Fairfax County, Virginia

Loudoun County

                                                     Arlington County

                                                         City of Alexandria

       Prince William
           County                                     Fairfax County

                          Fairfax County, Virginia
             Project Goals

   Make the State RCL (road centerline
    file) routable.
   Make the state RCL usable across
    jurisdictional boundaries.

                 Fairfax County, Virginia
Issues with Current State Data
   Edge-matching
   Inconsistent Geometry
    • Dual Centerline vs Single Centerline
    • Elevated Crossings
   Inconsistent Naming Standards
    • INT95 vs I95
    • No route numbers
   No One Way Information
   Missing Speed Limits
   Overlapping Addresses or Gaps at Borders

                      Fairfax County, Virginia
 NOVA Regional
Routable Centerline

      Fairfax County, Virginia
           Task Summary
   Task 1: Document Summary of
    Existing Jurisdiction and Source Data
    Quality and Completeness
   Task 2: Define Data Model
   Task 3: Develop SOW
   Task 4: Develop RFP
   Task 5: Data Conversion to New Model

                 Fairfax County, Virginia
           Task Summary
   Task 6: Data QC
   Task 7: Develop Maintenance Tools
   Task 8: Specific Changes to Support
    Local Installation
   Task 9: Develop Best Practices Guide
   Task 10 (optional): Publication and
    Dissemination of Results
   Hardware/Software

                 Fairfax County, Virginia
    Major Issues Supporting CAD
              with GIS
   Address Point Location vs Centerline
    Address Location
   Complex Intersections
   Elevated Crossings
   Street Names
   Road Closures
   One Way

                 Fairfax County, Virginia
    Major Issues Supporting CAD
      with Regional GIS Data
   Address Ranges along borders
   Defining borders
   Complex Intersections
   Elevated Crossings become even worse
   Street Names
   Street ID’s
   One Way Data

                Fairfax County, Virginia
    Making the RCL Routable
   Establish a speed limit attribute
   Establish a common state-wide road
    classification scheme
    • Primary, Secondary, Local, etc
   Establish a state-wide methodology for
    dealing with elevated crossings
   Establish a one way attribute

                   Fairfax County, Virginia
Elevated Crossings

      Fairfax County, Virginia
Elevated Crossings in CAD

         Fairfax County, Virginia
Boundary X,Y Points

      Fairfax County, Virginia
                                     State RCL Data Model
                                           ESRI Classes::Feature                                       ESRI Classes::Object
                                      +Shape : esriFieldTypeGeometry                               +OBJECTID : esriFieldTypeOID
                                                                                                                                                                                                                  {Alias = Street Name}
          NVRRCL_BDY_XY                                                                                                                                                                                   -STREET_NAME
   {Alias = NVRRCL Boundary XY,                                               NVRRCL_CENTERLINE                                                                                                           -STREET_TYPE
 GeometryType = esriGeometryPoint}                                           {Alias = Street Centerline,                                                                                                  -STREET_SUFFIX
-V_BDY_XY_ID                                                            GeometryType = esriGeometryPolyline}                                                                                              -STREET_POST_MOD
-X_COORD                                                               -V_LOCALID                                                                                                                         -FULL_NAME
-Y_COORD                                                               -V_NAME_LOCALID                                                                                                                    -RT_NUMBER
-LAST_UPDATE                                                           -SEG_TYPE = 0                                                                                                                      -LOCAL_UPDATE
                                                                       -SPEED_LIMIT = 0                                                                                                                   -V_FIPS
                                                                       -SPEED_TYPE = 0
                                                                       -ZLEVEL_FR = 0
                                                                       -ZLEVEL_TO = 0                             0..*
      NVRRCL_LOCATION                                                  -MAX_WIDTH = 0
         {Alias = Location,                                            -MAX_HEIGHT = 0
 GeometryType = esriGeometryPoint}                                     -MAX_WEIGHT = 0
-V_LOC_LOCALID                                                         -MTFCC
                                                                       -SEG_EXIST = Y                                                               «RelationshipClass»
-LOC_TYPE = 0                                                                                                                                                                                              Objects::NVRRCL_STREET_ALIAS
                                                                       -ONEWAY = N                                                 Relationships::NVRRCL_CenterlinesHaveAliasNames
-LOCAL_UPDATE                                                                                                                                                                                                  {Alias = Street Name Alias}
-V_FIPS                                                                -REVERSIBLE = N                                            -V_LOCALID
                                                                       -L_FIPS                                                    -V_ALIAS_LOCALID
                                                                                                                     1                                                                                    -ALIAS_PREFIX
                                                                                                                                                                                               0..*       -ALIAS_PRE_TYPE
                                                                                               1                                                                                                          -V_FIPS

                                                                                                                                                                                                                {Alias = Address Range}
                                                                                                                                                                                            0..*        -RANGE_FORMAT = U
                                                                                                                                                                                                        -RANGE_TYPE = 1
                                                                                                                                                                                                        -RANGE_DIR = FT



                                                                                                                                                                                                           {Alias = Hundred Block Range}
                                                                                                                                                                                     0..*             -BLOCK_TO_NUM
                                                                                        Fairfax County, Virginia
         Regional Routable Data Set

     VGIN Road Center Line (RCL)

      Regional Routable Data Model

Arlington   Alexandria    Fairfax     Loudoun

  Interior Jurisdictions (cities, town, Ft. Belvoir, etc)
                 Next Steps

   Develop maintenance tools.
   Integrate new regional data in CAD.
   Publish / share results with other counties in
   Continue to meet.

                     Fairfax County, Virginia
   Enterprise collaboration
   Interaction and coordination between
    public safety and GIS

                 Fairfax County, Virginia

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