Multilevel Linear Referencing Systems & Temporal Data Management Phil Hardy & Bruce Aquila

Transcription

1 Multilevel Linear Referencing Systems & Temporal Data Management Phil Hardy & Bruce Aquila Security, Government & Infrastructure

2 Agenda Design goals of Temporal, Multilevel LRS 4 big hairy problems Maintaining a Temporal, Multilevel LRS Maintaining the data model Temporality Conflation Early Adopters Catalonia DGC Nevada DOT

3 Design goals of Temporal, Multilevel LRS Security, Government & Infrastructure

4 4 Big, Hairy Problems with Traditional LRSs 1. Not all parties reference the network in the same way

5 4 Big, Hairy Problems Multiple Linear Referencing Methods State Border Route 50 Main St. 175 Main St km State Cumulative Address Range: 100 to 200 Street Address Orange County Los Angeles County Intersection with Elm Ave. Intersection with Spruce Ave. Route 50 Main St. 5.4 km County Cumulative 200 m East Marker Offset

6 4 Big, Hairy Problems Multiple Linear Referencing Methods Traffic counts (Km Posts) Accidents (Intersection Referenced)

7 4 Big, Hairy Problems Multiple Linear Referencing Methods Refined results: high accident rate intersections

8 4 Big, Hairy Problems with Traditional LRSs 1. Not all parties reference the network in the same way 2. Not all parties use the same graphic representation of the network

9 4 Big, Hairy Problems Multiple Geometric Representations Different geometries for different uses LRS, Routing Demand Modeling Different sources, different coverages

10 4 Big, Hairy Problems with Traditional LRSs 1. Not all parties reference the network in the same way 2. Not all parties use the same graphic representation of the network 3. Roadway attributes can shift or even disappear over time

11 4 Big, Hairy Problems Attribute Stability Desired behavior

12 4 Big, Hairy Problems with Traditional LRSs 1. Not all parties reference the network in the same way 2. Not all parties use the same graphic representation of the network 3. Roadway attributes can shift or even disappear over time 4. There s no good way to compare past and present attributes (temporality)

13 4 Big, Hairy Problems Attribute Stability Need to compare the before with the after After network changes

14 The Solution Multilevel, Temporal LRS Independent LRMs & Geometries tied to a bedrock, solid Linear Datum Events Linear Referencing Methods Linear Datum Geometry

15

16 Maintaining a Temporal, Multilevel LRS Security, Government & Infrastructure

17 Multilevel LRS Data Maintenance Getting Started Convert Single level LRS to Multilevel LRS LRM LRM Reference Datum Reference Linear Feature Class LRM Reference Datum Reference Linear Datum Geometry Reference Easy transition to Multilevel LRS Geometry Reference Geometry

18 Multilevel LRS Data Maintenance Intelligent LRM Feature Use new Display LRM command Creates an intelligent linear feature class Simplifies both analysis and maintenance

19 Multilevel LRS Data Maintenance Intelligent Editing Commands Multilevel LRS aware editing commands Insert LRM Segment Delete LRM Segment Redigitize LRM Segment Split LRM Segment Merge LRM Segments Interactive LRS Calibration LRS Calibration Interactive Multilevel LRS Conflation Multilevel LRS Conflation Multilevel LRS Validation Smart editing commands for MLRS

20 Multilevel LRS Data Maintenance Intelligent Editing Commands Add, Delete, Split, Merge, & Digitize Commands understand MLRS LRM changes on LRM layer Geometry changes on Geometry layer Commands understands measures Changes don t affect data location stability

21 The Solution LRM Conversions LRM LRM Conversion LRM Datum Conversion LRM LRM LRM Datum LRM LRM LRM

22 Multilevel LRS Data Maintenance Maintaining a Temporal LRS GeoMedia Transaction Manager (GTM) LRS! Temporal GIS! Open Editing Session Edit as normal Commit Changes & Close Curve Realignment 07/07/03 Modified

23

24 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability Our simulation Before Dangerous Curve Linear Event (Pavement Condition) Point Events (Accidents) LRS Segments

25 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability Modeling a realignment that went into effect on 7/7/03 Open a GTM editing session Set Valid Time dates Oracle Object LTT R W Curve Realignment 07/07/03 Modified Dockable control

26 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability Take out the curve with the Redigitize LRM Segment command

27 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability Readjust measures with the Interactive LRS Calibration command

28 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability Readjust measures with the Interactive LRS Calibration command

29 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability When edits are complete, use GTM to commit changes and close editing session

30 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability Turn Event data back on 1. Event data doesn t shift. 2. No off road Events show up 3. No editing of Event tables was required

31 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability Use GTM to look at the past before our realignment 07/07/03 Oracle Object LTT R W None 07/07/03 Modified

32 GM Transportation Manager & GM Transaction Manager Temporality, Maintenance, and Stability Use GTM to look at the past before our realignment 01/01/03 Oracle Object LTT R W None 01/01/03 Modified Event data is displayed as it was prior to the realignment

33 One More Big, Hairy Problem

34 LRS Conflation A Tough Problem Often difficult to correlate the 2 data sets Each data set is segmented differently Event data is tied to the network Affects multiple layers Source: Alan Witmer

35 Multilevel LRS Data Maintenance Multilevel LRS Conflation Dual vs. Single Centerline Keystone Ave. A Tough Problem Often difficult to correlate the 2 data sets Each data set is segmented differently Event data is tied to the network Affects multiple layers Dual vs. Single Repercussions Or should these points correlate? 80 Significant location differences SDS CDS

36 Multilevel LRS Data Maintenance Multilevel LRS Conflation 395 SDS only Ramps CDS only Ramps N. McCarran Blvd. SDS CDS

37 GM Fusion Linking Methodology Handles variations in segmentation New data Link 1 Link 2 Link 3 Link Existing LRS

38 Multilevel LRS Data Maintenance Multilevel LRS Conflation Both Use interactive it to replace and bulk conflation existing data supported with Bulk better conflation data assisted by Use GeoMedia it to add Fusion LRMs Use it to add Geometric representations Use it to add to existing data

39 LRS Conflation Event data location stability

40 Problem Solved!

41 Early Adopters Security, Government & Infrastructure

42 Early Adopters Catalonia DGC

43 Time series of AADT veh/day in veh/day in veh/day in 1997 Traffic at peak hour

44 1600 veh/day 2400 veh/day 3200 veh/day Intermunicipal mobility for work travel

45 Access time to FRANCE without the EIX TRANSVERSAL

46 Time savings using the EIX TRANSVERSAL

47 Early Adopters Nevada DOT

48 Identifying High Crash Intersections

49 Sliding Scale Analysis

50 Raster Analysis

51 Taming big hairy problems!

52