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. 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)

GEOG 4650/5650

2009 Spring

Week 2

Goal : to model real-world networks
• Solving transportation problme
• Streets
• Busline
• Turns
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
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
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.
Creating Network Dataset
• Start ArcCatalog
• Right-click Street layer
• Select New Network Dataset