Enterprise Centerline Data Enterprise Centerline Data & & Metro Nashville Public Metro Nashville Public Works Works Mr. Donald Reid, Mr. Donald Reid, Paving and ROW Operations Manager, Paving and ROW Operations Manager, Metro Nashville Public Works Metro Nashville Public Works [email protected][email protected]Jeff Deason, Jeff Deason, GIS & IT Services Manager, GIS & IT Services Manager, Collier Engineering Co., Inc. Collier Engineering Co., Inc. [email protected][email protected]
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Enterprise Centerline Data & Enterprise Centerline Data & Metro Nashville Public WorksMetro Nashville Public Works
Mr. Donald Reid, Mr. Donald Reid,
Paving and ROW Operations Manager,Paving and ROW Operations Manager,
Metro Nashville Public WorksMetro Nashville Public Works
• The Enterprise-wide Availability of GIS Data The Enterprise-wide Availability of GIS Data Representing the Metro Nashville – Davidson Representing the Metro Nashville – Davidson County Roadway Network.County Roadway Network.
• The Use of Centerline (CL) Data within the The Use of Centerline (CL) Data within the Metro Public Works Long-Term Pavement Metro Public Works Long-Term Pavement Preservation Program & Across MPW.Preservation Program & Across MPW.
• The Relationship Between These MPW The Relationship Between These MPW Programs & the Continual Improvement of the Programs & the Continual Improvement of the Enterprise Dataset.Enterprise Dataset.
The Enterprise-wide Availability of GIS The Enterprise-wide Availability of GIS Data Representing the Metro Nashville – Data Representing the Metro Nashville – Davidson County Roadway NetworkDavidson County Roadway Network
• Access and stewardship of the enterprise CL Access and stewardship of the enterprise CL data resource in the Metropolitan Government data resource in the Metropolitan Government of Nashville & Davidson County is distributed of Nashville & Davidson County is distributed among several departments for multiple uses. among several departments for multiple uses.
• Distributed access to the live CL data is Distributed access to the live CL data is provided through ESRI ArcSDE from the Metro provided through ESRI ArcSDE from the Metro Nashville Planning Department. Nashville Planning Department.
• Good communication between departments Good communication between departments results in workable access agreements and results in workable access agreements and fosters continual improvement to the fosters continual improvement to the usefulness and accuracy of the street data.usefulness and accuracy of the street data.
CL Data Access OptionsCL Data Access Options
• Metro employees can access the “live” CLs by Metro employees can access the “live” CLs by connecting to a geodatabase feature class being connecting to a geodatabase feature class being served through ESRI ArcSDE in Metro Planning.served through ESRI ArcSDE in Metro Planning.
• Employees can refer to the Planning section of Employees can refer to the Planning section of the nashville.gov web site for search, view, pan, the nashville.gov web site for search, view, pan, zoom.zoom.
• Employees can work with shapefile or personal Employees can work with shapefile or personal geodatabase “snapshots” of the live street data, geodatabase “snapshots” of the live street data, if required.if required.
““Live” CL Access Through Live” CL Access Through Planning’s GeodatabasePlanning’s Geodatabase
• ““Up” Side: Most Accurate ReferenceUp” Side: Most Accurate Reference
• ““Down” Sides: Down” Sides: – Multiple Potential Choke PointsMultiple Potential Choke Points• Must establish login & passwordMust establish login & password• Auto-expiring passwordsAuto-expiring passwords• Dependent on performance of the RDBMSDependent on performance of the RDBMS• Dependent on performance of all network connections Dependent on performance of all network connections
between the RDBMS and the user’s computerbetween the RDBMS and the user’s computer– A “closed” datasetA “closed” dataset– EditsEdits generally limited to the E-911 Coordinator generally limited to the E-911 Coordinator– Can’t be accessed directly by 3Can’t be accessed directly by 3rdrd-party apps-party apps
Centerline Access via Centerline Access via the Nashville.gov Webthe Nashville.gov Web
• Good for view-only accessGood for view-only access
• No real No real analysisanalysis other than visual. other than visual.
• Site geared to find parcel data and other Site geared to find parcel data and other resources based on address, not specifically to resources based on address, not specifically to query/find street data. query/find street data.
• Google Maps or HandyMap may be just as Google Maps or HandyMap may be just as useful, and more user-friendly for orientation useful, and more user-friendly for orientation and connectivity issues, etc.and connectivity issues, etc.
Centerline Snapshots of Centerline Snapshots of the “Live” CL Datathe “Live” CL Data
• Shapefiles or personal geodatabase feature Shapefiles or personal geodatabase feature classes extracted from the enterprise CL dataset.classes extracted from the enterprise CL dataset.
• More suitable for use with 3More suitable for use with 3rdrd-party apps, but -party apps, but disconnected from the enterprise resource.disconnected from the enterprise resource.
• Edits made to Edits made to snapshotsnapshot may be useful for may be useful for enterpriseenterprise, but getting that back into the , but getting that back into the enterprise geodatabase requires careful planning enterprise geodatabase requires careful planning and communication between departments.and communication between departments.
Metro Nashville CL Data: Product of Metro Nashville CL Data: Product of
• Some of the linework has been: Some of the linework has been: – Digitized from old Mylar/paper parcel mapsDigitized from old Mylar/paper parcel maps
– Derived from plans provided by developersDerived from plans provided by developers
– Hand-digitized from orthophotography or Hand-digitized from orthophotography or from ROW polygonsfrom ROW polygons
– Imported from CAD data Imported from CAD data
Metro Nashville CL Data: Product of Metro Nashville CL Data: Product of Multiple Sources & ProcessesMultiple Sources & Processes
• Some of the data attribute values have Some of the data attribute values have been:been:– Bulk-loaded from other systems or projects Bulk-loaded from other systems or projects
as needed/availableas needed/available
– Hand-edited by consultants and staff in Hand-edited by consultants and staff in multiple departmentsmultiple departments
– Structurally re-defined as part of a recent Structurally re-defined as part of a recent RDBMS migrationRDBMS migration
Metro Nashville CL Data Metro Nashville CL Data Structure & AttributesStructure & Attributes
• Segmentation terminates at nodesSegmentation terminates at nodes
– Intersections with other streetsIntersections with other streets
– BridgesBridges
– Satellite City boundariesSatellite City boundaries
– County boundariesCounty boundaries
Metro Nashville CL Data Metro Nashville CL Data Structure & AttributesStructure & Attributes
– TO_STREET (intersecting street at segment’s TO_STREET (intersecting street at segment’s highest address point)highest address point)
– NAVIGABLE (related to OFFICIAL_STATUS NAVIGABLE (related to OFFICIAL_STATUS and LEGISLATION)and LEGISLATION)
Metro Nashville CL Data Metro Nashville CL Data Structure & AttributesStructure & Attributes
• AddressingAddressing– LEFT_FROM (lowest address value possible on the left LEFT_FROM (lowest address value possible on the left
side of this segment)side of this segment)
– LEFT_TO (highest address value possible on the left LEFT_TO (highest address value possible on the left side of this segment)side of this segment)
– RIGHT_FROM (lowest address value possible on the RIGHT_FROM (lowest address value possible on the right side of this segment)right side of this segment)
– RIGHT_TO (highest address value possible on the RIGHT_TO (highest address value possible on the right side of this segment)right side of this segment)
Metro Nashville CL Data Metro Nashville CL Data Structure & AttributesStructure & Attributes
• Accepted StatusAccepted Status– Accepted: Adopted and maintained by Metro Nashville – Accepted: Adopted and maintained by Metro Nashville –
Davidson CountyDavidson County
– Accepted: “State Aid” segments are maintained by Metro Accepted: “State Aid” segments are maintained by Metro Nashville with State fundingNashville with State funding
– Not Accepted: State or Other Government / “Satellite Not Accepted: State or Other Government / “Satellite Cities”Cities”
– Not Accepted: Private Roads/DrivesNot Accepted: Private Roads/Drives
– Not Accepted: Under DevelopmentNot Accepted: Under Development
Metro Nashville CL Data Metro Nashville CL Data Structure & AttributesStructure & Attributes
• Legislative ActsLegislative Acts– Acceptance DateAcceptance Date
• Streets in new subdivisions may take years before Streets in new subdivisions may take years before acceptance, depending on several variablesacceptance, depending on several variables
• Accepted streets in newly annexed areas would Accepted streets in newly annexed areas would likely all have the same acceptance date.likely all have the same acceptance date.
– Abandonment DateAbandonment Date• Existing, but no longer maintained.Existing, but no longer maintained.• No longer existing due to developmentNo longer existing due to development• Either way, it’s a historic line now.Either way, it’s a historic line now.
– Naming ChangesNaming Changes
Metro Nashville CL Data Metro Nashville CL Data Structure & AttributesStructure & Attributes
• Other Fields AvailableOther Fields Available– Many other (UNETRANS) fields available.Many other (UNETRANS) fields available.– Some are populated and maintained.Some are populated and maintained.– Some have been partially populated for Some have been partially populated for
studies or short-term projects, but not studies or short-term projects, but not maintained.maintained.
– Others are there for future use, but have Others are there for future use, but have never been populated due to minimized never been populated due to minimized need.need.
CL Data is the Basis for CL Data is the Basis for Several Processes within Several Processes within Public WorksPublic Works
• Customer Service Department: Customer Service Department: ArcView & CityworksArcView & Cityworks– CL snapshot due to connection concerns vs always-on CL snapshot due to connection concerns vs always-on
nature of customer service.nature of customer service.
– Reps geocode incoming SR calls in real-timeReps geocode incoming SR calls in real-time
– Manual geocoding tools help reps to deal with SR incident Manual geocoding tools help reps to deal with SR incident addresses that don’t automatically geocode.addresses that don’t automatically geocode.
– Cross-departmental communication ensures E-911 Cross-departmental communication ensures E-911 Coordinator knows to analyze segments w/ geocoding Coordinator knows to analyze segments w/ geocoding issues.issues.
CL Data is the Basis for CL Data is the Basis for Several Processes within Several Processes within Public WorksPublic Works
• Customer service reps can Customer service reps can immediately close some service immediately close some service requests through simple geocoding.requests through simple geocoding.
– When is trash-pickup day for my street?When is trash-pickup day for my street?
– When will my street be paved?When will my street be paved?
– When will the alley behind my house be When will the alley behind my house be cleaned?cleaned?
CL Data is the Basis for CL Data is the Basis for Several Processes within Several Processes within Public WorksPublic Works
• Other SRs are assigned by type and Other SRs are assigned by type and priority to inspectors, who benefit priority to inspectors, who benefit from the CL data and geocoded SR from the CL data and geocoded SR data.data.– Immediate map-based identification of Immediate map-based identification of
active service requests by type and status active service requests by type and status and work sector.and work sector.
– Inspectors benefit from visual “clustering” of Inspectors benefit from visual “clustering” of active inspection workload to assist in active inspection workload to assist in simple route planning. simple route planning.
– Pattern recognition & reporting over time.Pattern recognition & reporting over time.
CL Data is the Basis for CL Data is the Basis for Several Processes within Several Processes within Public WorksPublic Works
• Maps and reports to enhance communication with Maps and reports to enhance communication with Finance, Metro Council, other departments, and Finance, Metro Council, other departments, and public citizens via 311 or Nashville.gov web site.public citizens via 311 or Nashville.gov web site.
CL Data Usage within the Paving CL Data Usage within the Paving Operations OfficeOperations Office
• Pavement Management workflow and Pavement Management workflow and maintenance decisions are supported by maintenance decisions are supported by – Physical inspections & annual photo and Physical inspections & annual photo and
distress data collectiondistress data collection
– Customer Service requests and other forms Customer Service requests and other forms of public inputof public input
– Cartegraph: PavementView for ArcGISCartegraph: PavementView for ArcGIS
Annual Roadway Data Annual Roadway Data Collection in Support of Collection in Support of Paving OperationsPaving Operations
• 4 photos shot every 20’ 4 photos shot every 20’ (front, front-right, rear-left, (front, front-right, rear-left, rear-down)rear-down)
• Laser distress analysis to Laser distress analysis to help gauge roughness and help gauge roughness and raveling .raveling .
•Process develops overall condition index Process develops overall condition index (OCI) for use in Pavement Management (OCI) for use in Pavement Management system.system.
CL Data Usage within the Paving CL Data Usage within the Paving Operations OfficeOperations Office
• While several of these projects use CL While several of these projects use CL data “snapshots”, some data elements data “snapshots”, some data elements from these projects would be of benefit from these projects would be of benefit to the enterprise users, so careful to the enterprise users, so careful process management ensures that the process management ensures that the appropriate aspects of locally-altered appropriate aspects of locally-altered segment data are reflected back to the segment data are reflected back to the enterprise geodatabase at appropriate enterprise geodatabase at appropriate intervals.intervals.
CL Data Usage within the Paving CL Data Usage within the Paving Operations OfficeOperations Office
• Example: Example: Last-paved DateLast-paved Date• This field is updated in PavementView This field is updated in PavementView
then pushed over the enterprise CL then pushed over the enterprise CL geodatabase. geodatabase.
• From there it is imported into the From there it is imported into the enterprise Permitting system (KIVA), enterprise Permitting system (KIVA), where it serves to trigger additional fees where it serves to trigger additional fees for applicants who apply for permits to for applicants who apply for permits to perform pavement cuts on recently perform pavement cuts on recently resurfaced roadways.resurfaced roadways.
Collected Data Helps Collected Data Helps Calculate OCICalculate OCI
• OCI values, threshold trigger values, and OCI values, threshold trigger values, and annual program funding levels influence annual program funding levels influence CarteGraph PavementView to make CarteGraph PavementView to make suggestions toward decisions on suggestions toward decisions on scheduling treatment scheduling treatment
TRANSPORTEDGEID is the Key to the TRANSPORTEDGEID is the Key to the Use of CL Data SnapshotsUse of CL Data Snapshots
• TRANSPORTEDGEID is the Primary Key. However, TRANSPORTEDGEID is the Primary Key. However, when a segment is split (new intersection when a segment is split (new intersection created), it results in a new TRANSPORTEDGEID created), it results in a new TRANSPORTEDGEID value for each of the resulting “children.” The value for each of the resulting “children.” The original “parent” segment (and ID) is retired and original “parent” segment (and ID) is retired and copied to an archival layer.copied to an archival layer.
• This means special care must be taken to ensure This means special care must be taken to ensure that appropriate data transfer occurs in the event that appropriate data transfer occurs in the event that segmentation changes while Paving-related that segmentation changes while Paving-related GIS/IT projects are working with a snapshot of the GIS/IT projects are working with a snapshot of the same area.same area.
Continued Data Improvement Continued Data Improvement
Through Distributed AccessThrough Distributed Access
• As with the use of Cityworks and RouteSmart, As with the use of Cityworks and RouteSmart, the programs in Paving Operations sometimes the programs in Paving Operations sometimes uncover CL data errors (network connectivity, uncover CL data errors (network connectivity, addressing, TO/FROM naming, accepted status, addressing, TO/FROM naming, accepted status, etc.), which are then forwarded to the E-911 etc.), which are then forwarded to the E-911 Coordinator for review/approval. Coordinator for review/approval.
• Such incremental improvement is another way Such incremental improvement is another way in which the use of data snapshots —usually in which the use of data snapshots —usually strongly advised against if enterprise data strongly advised against if enterprise data access is available— has proven access is available— has proven beneficialbeneficial to to the enterprise as a whole.the enterprise as a whole.
ConclusionsConclusions
• Metro Nashville – Davidson County provides several Metro Nashville – Davidson County provides several means for its staff and consultants and citizens to access means for its staff and consultants and citizens to access roadway centerline data.roadway centerline data.
• Real-time street CL data is available as a geodatabase Real-time street CL data is available as a geodatabase feature class served through ESRI ArcSDE, but can be feature class served through ESRI ArcSDE, but can be overkill for some projects and not enough for others.overkill for some projects and not enough for others.
• Some internal projects require direct access to analyze Some internal projects require direct access to analyze and edit a standalone snapshot of the CL dataset.and edit a standalone snapshot of the CL dataset.
• Managed carefully, the use of snapshots can ultimately Managed carefully, the use of snapshots can ultimately add value to the enterprise CL dataset.add value to the enterprise CL dataset.
