Database Development for Load-Restricted Zone in Texas By Pithon Vithayasricharoen

Objectives To develop a procedure for projecting the load-restricted zones on a road map of Texas To understand Linear Referencing and Dynamic Segmentation in ArcGIS To perform a pilot test on the road system in Travis County in order to verify the effectiveness of the developed procedure

What is Load-Restricted Zone? Sections of the transportation facilities legally posted to restrict excessive loading

Linear Referencing Using x,y,m coordinate system. Each point along a linear feature has a measure value (m value)

Dynamic Segmentation Allows multiple sets of attributes to be associated with any portion of a linear feature. Consists of 2 components Routes Route Events A unique identifier (Highway Name) Measure Values (M Values) Point Events Line Events

Data Sources The Street Network Shapefile of Travis County from BTS web site Load-Restricted Zone Database from TxDOT Milepoint Reference Marker Database from CTR

Create the Routes Requirement A unique identifier A measurement system

Aggregate features

Export Shapefile to Geodatabase Enable the Measure Values (M Values) of TravisRoad Feature Class Contains M Values is set to Yes

M Values at Each Vertex M Values are NaN (Not a Number)

Assign M Values VBA Script Code IMSegmentation Important Interface for Dynamic Segmentation in ArcGIS SetAndInterpolateMsBetween Method for interpolating M values between minimum and the maximum M Values

M Values Populated by VBA Script Code

Route Events (Load-Restricted Zone) 7.813 0.040 – 0.040 = 0.00 1.984 + 1.206 = 3.19 9999 1.984 5.969 0.040 0558 0562 0556 3.984 0.000 0000 0560

Create the Route Events Table Using VB Code Access Both Database Create the Route Events Table in Ms Access Create the Route Events Table for each county

Add Route Event Table in ArcGIS

Results

Future Work Perform the Dynamic Segmentation for every county in the State of Texas Develop the GIS-integrated database for Load-Restricted Zone of the highway network in the State of Texas

Acknowledgment Dr. David R. Maidment Dr. Zhanmin Zhang Venkatesh Merwade Uarporn Nopmongcol

Questions ?