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Kirk Sherrill - GIS Specialist Brent Frakes – Geographer Stephani Schupbach – GIS Specialist NRPC – I&M Div

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Kirk Sherrill - GIS Specialist Brent Frakes – Geographer Stephani Schupbach – GIS Specialist NRPC – I&M Div - PowerPoint PPT Presentation


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Inventory & Monitoring Division – GIS Program. Travel Time Cost Surface Model (TTCSM). Kirk Sherrill - GIS Specialist Brent Frakes – Geographer Stephani Schupbach – GIS Specialist NRPC – I&M Division – GIS Program Fort Collins, CO George Wright Society Conference

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Presentation Transcript
slide1

Inventory & Monitoring Division – GIS Program

Travel Time Cost Surface Model (TTCSM)

Kirk Sherrill - GIS Specialist

Brent Frakes – Geographer

StephaniSchupbach – GIS Specialist

NRPC – I&M Division – GIS Program

Fort Collins, CO

George Wright Society Conference

GIS Rapid Fire – March, 2011

TTCSM - SOP

the ttcsm

Inventory & Monitoring Division – GIS Program

The TTCSM:
  • Is a GIS Python Model which:
    • Calculates travel times from defined point(s) to other locations in an AOI
    • Dynamic: User and Park Specific
    • Uses readily available GIS Data
  • Efficient Field Data Sampling Design and Planning
  • Packaged as two python scripts
    • Requiring only basic programming experience
    • Moderate GIS experience
slide3

Inventory & Monitoring Division – GIS Program

  • TTCSM is a linear model which performs:
    • Cost Surface
    • Speed Surface
    • Travel Cost Surface
    • Travel Time Modeling

Inventory & Monitoring Division

TTCSM - Schematic

slide4

Inventory & Monitoring Division – GIS Program

  • Cost Surface
    • Represents the amount of travel speed resistance per cell
    • Generated in a simple overlay manner
    • Key Steps:
      • Determine desired input layers and order
      • Assign Percent of Maximum Travel Speed (PMTS) values for each data layer

Inventory & Monitoring Division

slide5

Inventory & Monitoring Division – GIS Program

  • Speed Surface
    • Defines the travel speed (seconds/per meter) per cell
    • Function:
      • Road Network Speed
      • Trail Speed
      • Hillslope Speed
  • Trail and Hillslope Speed are defined using Slope values and Tobler’s (1993) equation:

Inventory & Monitoring Division

Tobler, W. 1993. Three presentations on geographical analysis and modeling. Technical report. 93-1, National center for geographic information and Analysis, University of California, Santa Barbara.

slide6

Inventory & Monitoring Division – GIS Program

  • Travel Cost Surface
    • Final Travel Speed at which movement in a cell occurs.

Travel Cost Surface (miles/hour) for ROMO

slide7

Inventory & Monitoring Division – GIS Program

  • Final Step: Travel Time Modeling

1. Traditional Cost Distance Modeling

      • ArcGIS Cost Distance Function
      • Isotropic Model (treats all directions as equal)

Travel times for a TTCSM which used Cost Distance Modeling

slide8

Inventory & Monitoring Division – GIS Program

  • Directionality Matters (Anisotropic) – incorporate the influence of Slope
  • More Realistic User Specific Travel Times (Upslope and Downslope)
  • 9 Predefined Path Distance Scenarios

2. Path Distance Modeling

- ArcGIS Path Distance Function

Travel Speed by Slope for five different flat surface walking speeds when using path distance modeling with a “linear” Path Distance Scenario.

slide9

Inventory & Monitoring Division – GIS Program

    • Travel Time Modeling Output:

- Travel Time Grid(s): Hours, Minutes, or Seconds

  • Least Cost Paths
    • One Way or Round Trip Least Cost Paths

Travel time least cost paths using an inverse linear path distance travel time model

slide10

Inventory & Monitoring Division – GIS Program

  • TTCSM Summary
    • Dynamic in nature to accommodate user Specific Travel Time Modeling Needs
    • Outputs Travel Time Grids andTravel Time Least Cost Paths
    • Runs in the Python Scripting Language on a computer with ArcGIS 9.3
    • Working on Arc10 functionality – ESRI Problem between versions!
  • Scripts and SOP are Downloadable at:
    • http://nrinfo.nps.gov/ - Search for “TTCSM”
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