Automatic Turntable Extraction and Impedance Caluclation Tool for ArcGIS 9.2

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# Automatic Turntable Extraction and Impedance Caluclation Tool for ArcGIS 9.2 - PowerPoint PPT Presentation

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

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?
• Accuracy of drive time calculation
• Purpose of the project
• Automation
Methodology
• Description of input data
• Network Dataset within a geodatabase
• Simplified dataset
• Intersection example
• Required output
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
• 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