Translation of linear reference crash data to on street cross street nomenclature
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Translation of Linear-Reference Crash Data to On-Street/Cross-Street Nomenclature PowerPoint PPT Presentation


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Translation of Linear-Reference Crash Data to On-Street/Cross-Street Nomenclature. Crash Data Universe. 7,707 DHSMV Not in Local DBASE. 51,180 DHSMV in Local DBASE. 58,887 DHSMV Records 1999 – 2001. 2,019 DOT Not in Local DBASE but in DHSMV. 21,812 DOT RECORDS 99 & 00 ONLY.

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Translation of Linear-Reference Crash Data to On-Street/Cross-Street Nomenclature

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Translation of linear reference crash data to on street cross street nomenclature

Translation of Linear-Reference Crash Data to On-Street/Cross-Street Nomenclature


Translation of linear reference crash data to on street cross street nomenclature

Crash Data Universe

7,707 DHSMV Not in Local DBASE

51,180 DHSMV in Local DBASE

58,887

DHSMV Records

1999 – 2001

2,019 DOT Not in Local DBASE but in DHSMV

21,812

DOT RECORDS

99 & 00 ONLY

103,298 Hillsborough County and COT Crash Records

1999 - 2001

395 DOT Not in Either DBASE

4,403 DOT Not in DHSMV

19,398 DOT in Local Data


What is linear referencing

What is Linear-Referencing

  • Roadway Section IDs

    • Section ID Comprised of three non-unique sets of data

      • County IDaa

      • Section #bbb

      • Subsection #ccc

        Forms Unique Roadway ID aabbbccc

    • Sections tend to follow State Road Numbers, but the relationship is not absolute

  • Mileposts

    • Three-digit precision ie: 10.687 Miles

    • Used with Roadway Characteristics Inventory (RCI) to record the location of:

      • Point Features/Events (Section – Milepost)

      • Linear Features (Section – Beginning Milepost – Ending Milepost)


What is linear referencing1

What is Linear-Referencing


On street cross street crash data

On Street / Cross Street Crash Data

  • Uses Intersection, Intersection Influence, and Offset Information

    • N. Florida Ave and Polk Street

    • At the Intersection

    • (or) Influenced by Intersection – 50 ft South

    • (of) Not at the Intersection – 200 ft North

  • Geo-location Methodology

    • Assign Crash Event to Appropriate Intersection (#@&*## !!!)

    • Filter Mid-block Crashes by Query of Intersection Influence Attribute

    • Either Remove Mid-Block Crashes or Use GIS Script to “back crashes off of the intersection”

Expletive Deleted


Pros and cons

Pros and Cons


Pros and cons1

Pros and Cons

Two Features

Drawn to Represent

Single Event


Locating crashes in gis using linear reference mileposts

Locating Crashes in GIS using Linear Reference Mileposts


Locating crashes in gis using linear reference mileposts1

Locating Crashes in GIS using Linear Reference Mileposts

  • A Route is a GIS Feature that has:

    • Common ID Attribute (Roadway ID aa.bbb.ccc)

    • XY coordinates

    • Geographic Length Attribute

    • M (measure) Attribute

  • A Route Event Theme is:

    • A table of Events such as Crashes, Point Attributes, Linear Attributes

    • Each Event Has

      • Roadway ID Attribute

      • Milepost Attribute (or Beginning and Ending MP info)


Associating route events with underlying point features

Associating Route Events with Underlying Point Features

  • ArcGIS 8.x ArcTool Box “Nearest Node” Tool

    • Associate a Point Feature from one Coverage with the nearest Node in another coverage

  • Error Trapping

    • Check if all State Road Intersections are assigned Local Centerline Intersection Ids

    • Check if all Local Intersections within a buffer of State Routes are assigned a Section and Milepost #

    • Manually Review all Interchanges and Areas of Complex Geometry


Pros and cons2

Pros and Cons

Difficult Many to One

Relationship


Pros and cons3

Pros and Cons

Propagated

Spatial Error


Pros and cons4

Pros and Cons

Local Centerline

Removes “Doglegs”


Associating crash data with intersections

Associating Crash Data with Intersections

  • “Jump” Crash Event to Nearest DOT Intersection Feature

  • Store the Offset Distance

  • Transfer DOT Crash to Associated Local Centerline Intersection

  • Use Crash Offset Script to relocate crash to correct position using local centerline Geometry


Contact info

Contact Info:

Demian Miller

Tindale Oliver & Assoc.

Tampa, FL

813.224.8862

[email protected]


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