automatic turntable extraction and impedance caluclation tool for arcgis 9 2 l.
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Automatic Turntable Extraction and Impedance Caluclation Tool for ArcGIS 9.2. Melissa J Rura Eugene Rura Jackie Carr. AAG 04/17/2007. Junction edge1 edge2 J1 e1 e2 J1 e1 e3. Introduction. What is a turntable? List of edges with a common junction Why is it necessary?

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automatic turntable extraction and impedance caluclation tool for arcgis 9 2

Automatic Turntable Extraction and Impedance Caluclation Tool for ArcGIS 9.2

Melissa J Rura

Eugene Rura

Jackie Carr

AAG

04/17/2007

introduction

Junction edge1 edge2

J1 e1 e2

J1 e1 e3

Introduction
  • What is a turntable?
    • List of edges with a common junction
  • Why is it necessary?
    • Accuracy of drive time calculation
  • Purpose of the project
    • Automation
methodology
Methodology
  • Description of input data
    • Network Dataset within a geodatabase
  • Simplified dataset
    • Intersection example
  • Required output
step 1a calculate turn direction
Step 1a- Calculate Turn Direction
  • Calculate the azimuth of both edges in the turn
  • Find the angle between the two azimuths
  • Test for direction by:

If then is a right turn; assign 10 second turn time

Else

If then is straight; assign 15 seconds to turn time

Else

If then is a left turn; assign 35 seconds to turn time

Else

If then is a u-turn; assign -95 seconds to turn time

back

conclusion and future work
Conclusion and Future Work
  • Include a step 3 where individual junctions or edges could be queried both spatially and by attribute to refine impedance locally
  • Include scientific operators in calculator

such as log and exp