1. Spatial Statistics UP206A: Introduction to GIS

2. Central Feature

3. Directional Distribution

4. NETWORK ANALYSIS UP206A: Introduction to GIS

5. What is Network Analyst 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

6. The Toolbar 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.

7. The Network Analyst Window 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.

8. Network Datasets 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

9. Network Attributes 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

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

11. Service Areas Complex polygon generation Allocation across networks

12. Closest Facility Fixed and mobile asset routing Emergency response

13. Driving Directions

14. 3 step program 1.Prepare you data by calculating cost fields 2.Create the network database 3.Do your analysis

15. Step 1 in detail 1.Obtain a street layer and clip it to your project area – Recommended to use Mapshare’s street data 2.Make sure it has a projected coordinate system (ex: UTM NAD 83 Zone 11N) 3.Add a field “METERS” (or appropriate map units for your layer) to calculate length using “calculate geometry” 4.Add and calculate field “MILES” 5.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 6.Add and calculate field DRIVE_MINS – SPEED_MPH / 60 = [miles per minute] – DRIVE_MINS = [MILES] /([SPEED_MPH]/60)

16. 3 step program 1.Prepare you data by calculating cost fields 2.Create the network database 3.Do your analysis

17. 3 step program 1.Prepare you data by calculating cost fields 2.Create the network database 3.Do your analysis