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Introduction to Network Analyst (adapted from ESRI Lessons)

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

mackenzie-gaines
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Introduction to Network Analyst (adapted from ESRI Lessons)

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  1. Introduction to Network Analyst(adapted from ESRI Lessons) GEOG 4650/5650 2009 Spring Week 2

  2. Goal : to model real-world networks • Solving transportation problme • Road – interstates, • Streets • Railroad • Busline • Turns

  3. 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

  4. Network Analyst in ArcMap

  5. Toolbar

  6. 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

  7. 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.

  8. Traveling Salesman Problem…..

  9. Barrier

  10. Creating Network Dataset • Start ArcCatalog • Right-click Street layer • Select New Network Dataset

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