improving iowa’s road centerline databases

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Improving Iowa’s Road Centerline Databases Bill Schuman, GIS Coordinator Karen Carroll, Transportation Data

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Improving Iowa’s Road Centerline Databases. Bill Schuman, GIS Coordinator Karen Carroll, Transportation Data. Session Outline. Linear Referencing System What is a linear referencing system? LRS Core Components LRS Maintenance Application - PowerPoint PPT Presentation

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Page 1: Improving Iowa’s Road Centerline Databases

Improving Iowa’s Road Centerline

Databases

Bill Schuman, GIS Coordinator

Karen Carroll, Transportation Data

Page 2: Improving Iowa’s Road Centerline Databases

Session Outline

• Linear Referencing System– What is a linear referencing system?– LRS Core Components– LRS Maintenance Application

• Geographic Information Information System (GIMS) Redesign

• Decision Support Environment– What is a Decision Support Environment?– Oklahoma DOT GRIP Demonstration

Page 3: Improving Iowa’s Road Centerline Databases

Session Outline

• Linear Referencing System– What is a linear referencing system?– LRS Core Components– LRS Maintenance Application

• Geographic Information Information System (GIMS) Redesign

• Decision Support Environment– What is a Decision Support Environment?– Oklahoma DOT GRIP Demonstration

Page 4: Improving Iowa’s Road Centerline Databases

Linear GIS Data Models Special Problems in Linear GIS

CartographicRepresentation

Business Data

Page 5: Improving Iowa’s Road Centerline Databases

Linear GIS Data Models Different Approaches

• Fixed length segments– All segments the same length– Must summarize data & very redundant

• Variable length segments– Segment determined by unique sections– Some summarization & redundancy

• No segments / dynamic segmentation– Minimizes redundancy– More database tables

Page 6: Improving Iowa’s Road Centerline Databases

0.1 mi

Linear GIS Data Models Fixed Segment Length

CartographicRepresentation

Business Data

0.1 mi

Page 7: Improving Iowa’s Road Centerline Databases

road_info

City ACity B

city_info

road_namepavement_typeno_of_vehiclesjurisdiction

Linear GIS Data Models Variable Segment Length

road_nameMain Street

road_namepavement_type

AsphaltConcrete

road_namepavement_typeno_of_vehicles

5002500

road_namepavement_typeno_of_vehiclesjurisdictionguard_railstructure

structure

road_namepavement_typeno_of_vehiclesjurisdictionguard_rail

guard_rail

Page 8: Improving Iowa’s Road Centerline Databases

Linear GIS Data Models Dynamic Segmentation Analysis

Pavement Type

Speed Limit

AADT Values

Friction

35 45 55

34 30 32

Asphalt Concrete

30000 22000

Asphalt

0

0

0

0

2.1

2.5

0.5 2.3 4.8

4.1 5.2

5.80.2

Linear Query Results where: Speed => 45

AADT < 25000 Pavement = Asphalt Friction =< 30

5.85.22.5 4.1

Page 9: Improving Iowa’s Road Centerline Databases

What does Iowa need to do?

Do we need

more accuracy?

How do we develop

a linear network?

What do our

customers need?

What linear datamodel shouldwe use?

How do we keep

our data current?

Page 10: Improving Iowa’s Road Centerline Databases

Meeting the NeedsIowa DOT’s Approach to Problem

• Created a team to make recommendations to DOT management

• Researched state of practice– Looked at accepted processes/systems– Looked at new processes/systems

• Inventoried current linear location methods used in Iowa

• Investigated linear location needs of Iowa’s data users

• General recommendation: Develop a Linear Reference System (LRS)

Page 11: Improving Iowa’s Road Centerline Databases

LRS Core ComponentsFundamental Definitions

• LRS - 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 known location.

– A LRS can relate a linear location (1D) to a spatial (2D) location through a centerline representation of the roadway.

• LRM - Linear Referencing Method– Different methods of measuring locations (i.e.

milepost, literal descriptions, stations, address ranges, etc.).

– A LRM is part of the LRS.

Page 12: Improving Iowa’s Road Centerline Databases

LRS Core Components The Team’s Recommendations

• Need to improve spatial representation of the road centerlines

• Use NCHRP (20-27) project model

• Need ability to integrate variety of data– Mile post referenced data (US 30 @ 135.23)– Coordinate referenced data (Lat, Long, I35)– Literal description data (2.51 mi past 1st St)– Road address data (247 E. Main St)

• Establish maintenance processes and partnerships

Page 13: Improving Iowa’s Road Centerline Databases

LRS Core Components Simplified Visual

CoordinateRoute

ReferencePost

GIMSSegmental

Milepoint StationingLiteral

Description

BaseRecordCrash PMIS Inventory Project

DataProgram

Page 14: Improving Iowa’s Road Centerline Databases

LRS Core Components Simplified Visual

LRS Components

CoordinateRoute

ReferencePost

GIMSSegmental

Milepoint StationingLiteral

Description

BaseRecordCrash PMIS Inventory Project

DataProgram

CenterlineRepresentation 2

CenterlineRepresentation 3

CenterlineRepresentation 1

AddressRange

Page 15: Improving Iowa’s Road Centerline Databases

LRS Core Components Statewide Data Collection Effort

• Centerline collection complete for all Interstate, US, and State roads

• Eight counties collected

• Collected from best image source available

Page 16: Improving Iowa’s Road Centerline Databases

LRS Core Components Local Roads in LRS

• Four counties

• All primary roads completed by end of FY03

• 28E Agreement with City of Des Moines– Agree to maintain

street centerlines– $50,000 to LRS

Page 17: Improving Iowa’s Road Centerline Databases

LRS Core Components Comparison of Centerlines

Page 18: Improving Iowa’s Road Centerline Databases
Page 19: Improving Iowa’s Road Centerline Databases

LRS Core Components Feature Association

LRSx Conflation Object

LRSx Conflation Object

CartographicRepresentation

Datum

Network

%AS

%AS

%AS %AS

%AS %AS %AS%AS

Page 20: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application

• Maintains the data in the LRS database

• Constructed on commercially available products– GeoMedia (Professional & Transaction Mgr)– Oracle (Core, Spatial, & Workspace Mgr)– Location Data Manager Extensions (LDMx)

• Three-tier architecture

• Contains a change propagation engine, quality control checker, and temporal data management

Page 21: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application

Architecture

Page 22: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application

Architecture

Page 23: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application

Architecture

Page 24: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-Change

Tracking

Page 25: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-Metadata

Page 26: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-

Conflation

Page 27: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-

Conflation

Page 28: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-

Conflation

Page 29: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-Quality

Control

Page 30: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-Routes

Page 31: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-Temporal

Page 32: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-Temporal

Page 33: Improving Iowa’s Road Centerline Databases

LRS Core Components Maintenance Application-Temporal

Page 34: Improving Iowa’s Road Centerline Databases

LRS Core ComponentsConclusions

• LRS Purposes– Ability to integrate plethora of data– Remain scalable for future needs– Provide a comprehensive transportation

GIS

• LRS Maintenance Application– Make it easy to maintain a fairly complex

database– Provide good metadata and history for the

road network– Always ensures a quality database

Page 35: Improving Iowa’s Road Centerline Databases

Session Outline

• Linear Referencing System– What is a linear referencing system?– LRS Core Components– LRS Maintenance Application

• Geographic Information Information System (GIMS) Redesign

• Decision Support Environment– What is a Decision Support Environment?– Oklahoma DOT GRIP Demonstration

Page 36: Improving Iowa’s Road Centerline Databases

Session Outline

• Linear Referencing System– What is a linear referencing system?– LRS Core Components– LRS Maintenance Application

• Geographic Information Information System (GIMS) Redesign

• Decision Support Environment– What is a Decision Support Environment?– Oklahoma DOT GRIP Demonstration

Page 37: Improving Iowa’s Road Centerline Databases

L

inear B

usin

ess Data

Decision Support Environment

System Architecture for Integrating Data

Staging Process

Crash Records

PMIS

Bridge

GIMS

General DecisionSupport

CTAMS

PMIS

Sufficiency

Web CTAMS

Specific AnalysisSystems

Geo

Data L

ibrary

LRS Maintainer

Derived Data Valuesfrom Integrated Data

Derived Data Valuesfrom Integrated Data

LRS

GIS Maintainer

GIS

Page 38: Improving Iowa’s Road Centerline Databases

Decision Support Environment

Iowa DOT CTAMS Project

Page 39: Improving Iowa’s Road Centerline Databases

Decision Support Environment

Iowa DOT CTAMS Project

Page 40: Improving Iowa’s Road Centerline Databases

Decision Support Environment

Oklahoma DOT GRIP Project

Page 41: Improving Iowa’s Road Centerline Databases

Decision Support Environment

Oklahoma DOT GRIP Project

Page 42: Improving Iowa’s Road Centerline Databases

Decision Support Environment

Iowa DOT ERMS/GIS Integration Project

Page 43: Improving Iowa’s Road Centerline Databases

Decision Support Environment

Oklahoma DOT GRIP Project

Page 44: Improving Iowa’s Road Centerline Databases

Decision Support Environment

Oklahoma DOT GRIP Project

Page 45: Improving Iowa’s Road Centerline Databases

Session Outline

• Linear Referencing System– What is a linear referencing system?– LRS Core Components– LRS Maintenance Application

• Geographic Information Information System (GIMS) Redesign

• Decision Support Environment– What is a Decision Support Environment?– Oklahoma DOT GRIP Demonstration

Page 46: Improving Iowa’s Road Centerline Databases

Presentation Wrap-up Benefits of the LRS - Opportunities for

Savings

• Provides a centralized data source for most road transportation information systems

• Minimizes redundancy• City Government (Utilities, Engineering)• County Government (Engineering, Assessor)• State Government (DOT, Emergency Mgmt)• Federal Government (Census, FHWA)

• Expend resources to provide more extensive and accurate data, rather than similar copies

• Benefits homeland security and emergency management

• Share maintenance effort

Page 47: Improving Iowa’s Road Centerline Databases

Additional Information

• Presentation available at:

www.iowadotmaps.com

Click on the “Links” pulldown

Pens have web page printed on side

• New 2004 Transportation Map!– Just released today!

Page 48: Improving Iowa’s Road Centerline Databases

Questions