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					         Creating a
Regional Routable Centerline
    in Northern Virginia

       Brendan Ford



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

   Fairfax County started project to replace
    Computer Aided Dispatch (CAD) System in
    2005.

   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
    Program
    • 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
                        Participants


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
                                                                                                                                                                                                           Objects::NVRRCL_STREET_NAME
                                                                                                                                                                                                                  {Alias = Street Name}
                                                                                                                                                                                                          -V_NAME_LOCALID
                                                                                                                                                                                                          -STREET_PRE_MOD
                                                                                                                                                                                                          -STREET_PREFIX
                                                                                                                                                                                                          -STREET_PRE_TYPE
          NVRRCL_BDY_XY                                                                                                                                                                                   -STREET_NAME
   {Alias = NVRRCL Boundary XY,                                               NVRRCL_CENTERLINE                                                                                                           -STREET_TYPE
 GeometryType = esriGeometryPoint}                                           {Alias = Street Centerline,                                                                                                  -STREET_SUFFIX
                                                                                                                                                                                               0..1
-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
                                                                                                                    1
                                                                       -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
                                                                                                                                                                                                          -V_ALIAS_LOCALID
                                                                       -L_FIPS                                                    -V_ALIAS_LOCALID
                                                                                                                                                                                                          -ALIAS_PRE_MOD
                                                                       -R_FIPS
                                                                                                                     1                                                                                    -ALIAS_PREFIX
                                                                       -ENTRY_DATE
                                                                                                                                                                                               0..*       -ALIAS_PRE_TYPE
                                                                       -LOCAL_UPDATE
                                                                                                                                                                                                          -ALIAS_NAME
                                                                       -V_FIPS
                                                                                                                                                                                                          -ALIAS_TYPE
                                                                                                                                                                                                          -ALIAS_SUFFIX
                                                                                                                                                                                                          -ALIAS_POST_MOD
                                                                                                                                                                                                          -FULL_ALIAS_NAME
                                                                                                                                                                                                          -LOCAL_UPDATE
                                                                                               1                                                                                                          -V_FIPS




                                                                                                                                                                                                         Objects::NVRRCL_ADDRESS_RANGE
                                                                                                                                                                                                                {Alias = Address Range}
                                                                                                                                                                                                        -V_RANGE_LOCALID
                                                                                                                                                                                                        -V_LOCALID
                                                                                                                                                                                                        -L_FROM_ADD
                                                                                                                                                                                                        -L_TO_ADD
                                                                                                                                                                                                        -R_FROM_ADD
                                                                                                                                                                                                        -R_TO_ADD
                                                                                                                                                                                            0..*        -RANGE_FORMAT = U
                                                                                                                                                                                                        -RANGE_TYPE = 1
                                                                                                                                                                                                        -RANGE_DIR = FT
                                                                                                                                                                                                        -LOCAL_UPDATE
                                                                                                                                                                                                        -V_FIPS



                                                                                                                                                                                                             1

                                                                                                                                                                                                                 0..*

                                                                                                                                                                                                       Objects::NVRRCL_HUNDRED_BLOCK
                                                                                                                                                                                                           {Alias = Hundred Block Range}
                                                                                                                                                                                                      -V_BLOCK_LOCALID
                                                                                                                                                                                                      -V_LOCALID
                                                                                                                                                                                                      -V_RANGE_LOCALID
                                                                                                                                                                                                      -BLOCK_FR_NUM
                                                                                                                                                                                     0..*             -BLOCK_TO_NUM
                                                                                                                                                                                                      -LOCAL_UPDATE
                                                                                                                                                                                                      -V_FIPS
                                                                                        Fairfax County, Virginia
         Regional Routable Data Set


     VGIN Road Center Line (RCL)

      Regional Routable Data Model

                                                    Prince
Arlington   Alexandria    Fairfax     Loudoun
                                                    William


  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
    VA.
   Continue to meet.




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




                 Fairfax County, Virginia

				
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posted:10/9/2011
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