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Introduction to Network Analyst (adapted from ESRI Lessons) PowerPoint PPT Presentation


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Introduction to Network Analyst (adapted from ESRI Lessons). GEOG 4650/5650 2009 Spring Week 2. Goal : to model real-world networks. Solving transportation problme Road – interstates, Streets Railroad Busline Turns. What does it solve?. Best route – find best route

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Introduction to Network Analyst (adapted from ESRI Lessons)

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Introduction to network analyst adapted from esri lessons l.jpg

Introduction to Network Analyst(adapted from ESRI Lessons)

GEOG 4650/5650

2009 Spring

Week 2


Goal to model real world networks l.jpg

Goal : to model real-world networks

  • Solving transportation problme

  • Road – interstates,

  • Streets

  • Railroad

  • Busline

  • Turns


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What does it solve?

  • Best route – find best route

  • Closet facility – find closet pizza store

  • Service area – find streets/zone from distance

  • Origin-destination cost matrix


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Network Analyst in ArcMap


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Toolbar


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Designing the Network Dataset

  • Network dataset can be shapefile,geodatabase or SDC dataset

  • Shapefile supports one edge source

  • Geodatabase supports multiple edge and junction sources

  • SDC – highly compressed countrywide street network (purchased from vendor)

  • Build Network Dataset : From ArcCatalog or ArcToolBox | Network Analyst | Network Dataset | Build Network


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Attributes of street files

  • distance, travel time, etc. For best results, name these fields the units of your impedances, as these fields will automatically be detected by the New Network Dataset wizard -- for example, you may want to name your travel time field "Minutes". For edge sources, if the impedance values differ based on direction of travel, provide a separate field for each direction of travel -- for example, "FT_Minutes" and "TF_Minutes".

  • If you are modeling one-way streets, be sure that your edge sources have a field specifying one-way street information. The New Network Dataset wizard will recognize a string field named "One_Way" or "Oneway", creating evaluators that interpret its values as follows:

    • "FT" or "F" indicates a one-way street only permitting travel in the digitized direction of the edge.

    • "TF" or "T" indicates a one-way street only permitting travel against the digitized direction of the edge.

    • "N" indicates a street that does not permit travel in either direction.

    • Any other value indicates a street that permits travel in either direction.


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Traveling Salesman Problem…..


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Barrier


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Creating Network Dataset

  • Start ArcCatalog

  • Right-click Street layer

  • Select New Network Dataset


  • Login