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Network Analysis

UP206A: Introduction to GIS. Network Analysis. The ArcGIS Network Analyst extension allows you to build a network dataset and perform analysis on a network dataset Used primarily on Transportation Networks This extension is composed of a number of parts:

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Network Analysis

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  1. UP206A: Introduction to GIS Network Analysis

  2. The ArcGIS Network Analyst extension allows you to build a network dataset and perform analysis on a network dataset • Used primarily on Transportation Networks • This extension is composed of a number of parts: • a wizard to create a network dataset (in ArcCatalog) • a dockable Network Analyst window (in ArcMap) • a Network Analyst toolbar (in ArcMap) • and a number of geoprocessing tools contained within ArcToolbox What is Network Analyst

  3. The Network Analyst toolbar is a combination of menus and buttons for adding and modifying network locations, generating directions, identifying network features, building networks, and performing analysis on network datasets. The Toolbar

  4. The Network Analyst Window is designed to help users quickly and easily manage their network analysis layers and the network analysis classes (containing network locations and results). This is a dockable window in ArcMap. The Network Analyst Window

  5. Networks used by ArcGIS Network Analyst are stored as network datasets (_ND) • A network dataset is created from the feature source or sources that participate in the network • It incorporates an advanced connectivity model that can represent complex scenarios, such as multimodal transportation networks • It also possesses a rich network attribute model that helps model impedances, restrictions, and hierarchy for the network • The network dataset is built from simple features (lines and points) and turns Network Datasets

  6. Cost • Measure and model impedances (mostly time or distance) • Can create custom “cost” fields, such as drive time (ex: Drive time = Distance / Speed limit) • Restrictions • One way streets, no pedestrians, construction zones • Hierarchy • Order assigned to network elements Network Attributes

  7. Multipoint routing • Add points dynamically or • Add points from an existing point layer Key Features: Routing

  8. Complex polygon generation • Allocation across networks Service Areas

  9. Fixed and mobile asset routing • Emergency response Closest Facility

  10. Driving Directions

  11. Prepare you data by calculating cost fields • Create the network database • Do your analysis 3 step program

  12. Obtain a street layer and clip it to your project area • Recommended to use Mapshare’s street data • Make sure it has a projected coordinate system (ex: UTM NAD 83 Zone 11N) • Add a field “METERS” (or appropriate map units for your layer) to calculate length using “calculate geometry” • Add and calculate field “MILES” • Add and calculate field WALK_MINS • Average pedestrian walking speed is 5km/h • 5000 meters/60 minutes or 83 meters/minute • WALK_MINS = [METERS]/83 • Add and calculate field DRIVE_MINS • SPEED_MPH / 60 = [miles per minute] • DRIVE_MINS = [MILES] /([SPEED_MPH]/60) Step 1 in detail

  13. Prepare you data by calculating cost fields • Create the network database • Do your analysis 3 step program

  14. Prepare you data by calculating cost fields • Create the network database • Do your analysis 3 step program

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