Solving LRS Challenges with Custom Transformers for Transportation Professionals
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The concept of LRS is simple, but its implement is a different story. FME since 2010 has the ingredients for LRS implementation, however few practitioners are leveraging the power of FME. The presenter will discuss key LRS operations and demonstrate the complexity of the workspaces addressing some of the LRS operations. The presenter will then conclude that LRS professionals could benefit from a suite of custom transformers with the LRS focus.
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Solving LRS Challenges with Custom Transformers for Transportation Professionals
- 1. Doing LRS the FME Way Bo Guo, PhD, PE Gistic Research, Inc. FME User Conference May, 2017 Vancouver, British Columbia
- 2. Outline The LRS Challenges FME for LRS LRS - Events Operations
- 3. FHWA-Sponsored ARNOLD Study “Linear referencing systems are among the most important and complex datasets within a DOT.” “Development and maintenance of a statewide, all roads network containing LRS is an involved and complex process.”
- 4. Linear Referencing System LRS Infrastructure: Route Network LRM1 LRMn Methods: Milepoint, Reference-offset EVTS EVTS EVTS EVTS Events: Crashes, Pavement Condition
- 5. Why LRS is challenging? LRS concept is simple LRS data structure is not complicated LRS data volume is not large LRS data is not as dynamic Data silos, Spatialality, Dependencies,...? It is the SAD!
- 6. SAD - Separation Anxiety Disorder! LRS event layer and LRS network LRS event layers SAD is in LRS’ DNA!
- 7. LRS Requirements & FME Task Categories Task FME Centerline Maintenance Interactive editing No/Yes Data import/export Yes ETL Yes LRS Operations Route (building and calibration etc.) Yes Events (incl. QC and analysis) Yes LRS Data Sharing Ability to publish web services Yes Programmatic access to LRS via APIs Yes Download of LRS information Yes
- 8. Common LRS Operations - Route Maintenance RouteBuilder, RouteCalibrator, ReferenceGenerator QC RouteQCer
- 9. Route Reference Route Meas XType XName XTopo Address Oak Rd 0 Node Begin 1 Oak Rd 0.5 Route Maple Ln Left 500 Oak Rd 0.5 Route A St Cross 500 Oak Rd 1 Route B St Right 1000 Oak Rd 1.1 Node End 1100 Oak Rd 1.6 Node Begin 1600 Oak Rd 1.8 Rail Rail Tracks Cross 1800 Oak Rd 2.2 Route D St Cross 2200 Oak Rd 3 Boundary Co. Boundary Cross 3000 … … … … … …
- 10. Common LRS Tasks ▪ Cardinal Orientation ▪ Creating Network Linear Elements (NLE) or Routes ▪ Adding Measures to NLE ▪ Creating Event Tables from Geometry ▪ Asset Management – Stationing Points ▪ NLE / Events ➔ Segments ▪ Dynamic Segmentation ▪ Segments ➔ NLE / Events ▪ Back / Ahead Measures Source: Dave Campanas
- 11. FME as an LRS Toolkit ▪ LRS Transformer Category ▪ Snipper ▪ LengthToPointCalculator ▪ MeasureGenerator ▪ MeasureExtractor ▪ MeasureSetter ▪ MeasureRemover ▪ Ad hoc Transformers ▪ LineJoiner creates Paths ▪ NeighborFinder ▪ LineOnLineOverlayer ▪ PathBuilder ▪ PathSplitter ▪ Data Joins ▪ FeatureMerger ▪ InlineQuerier ▪ SQLExecutor ▪ Joiner Source: Dave Campanas
- 12. Prerequisites for LRS Success ▪ Clean Data ▪ Even Cleaner Data ▪ Segments are noded and connect ▪ Complex edges are split at intersections ▪ Handy Transformers for Clean-up ▪ Snapper ▪ Intersector ▪ TopologyBuilder ▪ NetworkTopologyCalculator Source: Dave Campanas
- 13. Common LRS Operations - Events GeoCoding GeoCoder, RevGeoCoder Analysis EventDensityCalculator, EventSummarizer Operation Joiner (Overlayer), FeatureAreaOverlayer Maintenance MeasurePropogator, Merger QC EventQCer
- 14. Event QC Domain rule Mandatory Mandatory Gap rule Optional NA Overlap rule Optional Optional Linear Layer Route 0.0 45.5 Point Layer 10.5 19.5
- 15. Event Operations QC - EventQCer Join/Overlay EventJoiner, EventAreaOverlayer Analysis EventSummarizer, EventDensityCalculator Geocoding EventGeoCoder, EventReverseGeoCoder Misc EventMeasurePropogator, EventMerger
- 16. FME Xformers for Event Operations PointOnLineOverlayer, PointOnAreaOverlayer, LineOnAreaOverlayer, LineOnLineOverlayer, Clipper, MeasureExtractor, Snipper, NeighborFinder, StatisticsCalculator
- 17. Create SL Features from Events Attribute Value Event ID 1253 Route ID I-15P From Measure 375 To Measure 387 Geometry 375 387
- 18. Building Events as Straighlines
- 19. Custom LRS Transformer Samples youtube.com/user/linearbench
- 20. Summary LRS is more complex than it appears to be FME has ingredients to support LRS operations The key to event operations is to build straight- line features from events
- 21. Bo Guo, PhD, PE Certified FME Professional bo.guo@gisticinc.com https://www.youtube.com/user/linearbench