How Iowa DOT is using its Linear Referencing System. Eric Abrams Spatial Coordinator Iowa DOT Gis.iowadot.gov

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1 How Iowa DOT is using its Linear Referencing System Eric Abrams Spatial Coordinator Iowa DOT Gis.iowadot.gov

2 Linear Referencing System A set of procedures and methods for specifying a location as a distance, or offset, along a linear feature, from a point with a known location.

3 What Is Iowa s s LRS IS System to locate items along linear features by reference post, coordinate route, datum, literal description and mile point 5 million dollars worth of requirements and development available to other states at no charge Ability to leverage cost sharing and other development opportunities Mature and proven IS NOT System to store road attributes and features

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5 LRS I 35/80/235 Ramps

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8 114,00 Miles of Public Roads

9 LRS Features Created Anchor Points (139,868) Anchor Sections (80,212) Transport Nodes (216,208) Transport Links (314,805) Routes (117,925) Reference Posts (11,660)

10 How Does LRS Support Iowa DOT Improved access to data Improved integration of data Improved temporal information Focused system architecture Formalized procedures for data collection Single navigable network Minimizes redundancy in database maintenance and storage Includes all public roads Includes temporal changes allowing views of the data in the past, present and future.

11 How Does LRS Support Iowa DOT Ability to locate roadway features along a linear network Examples of transformations between Linear Referencing Methods (LRMs) Reference Post to Coordinate Route Mile Point to Reference Post Literal Description to Coordinate Route Mile Point Datum Accurate Centerline Ability to track network over time

12 How to Store Data for Use with LRS Reference Post Route: I 35 Direction: N Start Post: 86 Start Post Offset:.69 End Post: 89 End Post Offset: -.15

13 How to Store Data for Use with LRS Coordinate Route Route: I 235 Direction: E Start X: Start Y: End X: End Y:

14 Coordinate Route LRM Route: IA 45 Direction: E Start X: Start Y: 6978 Route: Y33 Direction: S Start X: Start Y: End X: End Y: North 1st St Main St South 1st St Oak Ave Maple Ave IA 45 Y33

15 Examples

16 Five Year Program Office of Program Management responsible for Iowa DOT 5 Year Program Uses LRS to locate project locations IDMS System stores reference post and business data Process in place to transfer data to Oracle and transform reference post locations to geometry Geometry created automatically! Analysis can be done with GIS software, SQL statements Provide shape and Google Earth files for public for consumption

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20 Sign Inventory Collect location with GPS or Reference Post Collect using well formed route (US 69 or I 35) Use location and Route to locate sign on LRS network Data and geometry stored in Oracle Scripts developed to produce geometry from well formed location component

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24 Culverts Store Culvert locations and inspection data in Oracle Use Excel files in field to collect inspection data Reference Post and Route for location Transform Excel files to LRS to produce geometry Pilot project a success

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28 Snow Runs Verify all routes are covered and how many miles does each maintenance garage cover Look into route optimization Store snow run data in a master Excel file Change file to store route in well formed LRS format Transformed Excel file to Oracle to produce geometries

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30 N&E Routes

31 All direction Routes

32 Routing Starting to do some pilot testing of routing Extracting transport links and nodes from LRS Technology being used in Pilot LANL's "NetworkX" package Display results in Google earth Each point to point path takes about 1 minute Metrics will be added Left turns Speed limits

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35 Geographic Information Management System (GIMS) Stores spatial location and business data for all public road centerlines, structures and rail crossings. Oracle Database GeoMedia, MicroStation and Oracle Forms to maintain location and business data GIMS stores business data..

36 GIMS LRS and GIMS have independent centerlines. Summer 2008 GIMS will conflate its business data to LRS centerlines One centerline using LRS functions and procedures dynamically segmenting road business data GeoMedia Front end Developed by Bentley Systems

37 Other Pilot Projects Area of Responsibility Material locations (Salt, Sand, Etc) Paint Deer Kill Z coordinate from LiDAR Overweight routing PM Locates (performance measure)

38 How can Iowa help You Partner Share costs Share new project development on a common network infrastructure Share, Share, Share

39 Example Agreement and Workflow Determine your needs and costs Come to Iowa to see what we have Look at the dollars you could save partnering with Iowa Define your direction Have Iowa come to your state to help set up your system Sample system requirements Oracle/Oracle Spatial with OWM ($50,000) GeoMedia Professional ($4000 per license) GeoMedia Transaction Manager ($4000 per license) Bentley LDMX ($18,000) Training and Staff Open to partnering on a Arc LRS Maintenance tool and reuse application and data tier of Iowa LRS

40 Questions