Introduction to Network Analyst (adapted from ESRI Lessons)

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Introduction to Network Analyst(adapted from
ESRI Lessons)

• GEOG 4650/5650
• 2009 Spring
• Week 2

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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

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