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Using ArcGIS Network Analyst Extension for Service Area and Route Analyses with City of Tacoma Spatial Data

Figure 1.

 
 
Used ArcGIS Network Analyst extension to determine service areas around point locations including fire stations, WIC (women, infants and children) retailers, and residential treatment centers (drug and alcohol treatment) in Tacoma, WA.
 
 
 
 
 
 
 
Figure 1: Service areas of one-, five- and ten minute drive times are indicated around each Tacoma EMS fire station.
Figure 2: Service areas of five-, ten- and fifteen minute walk times are indicated around each Tacoma residential treatment center.
 
I assumed a walking speed of 3 miles per hour for this network analysis to determine residential treatment service areas. For this analysis, I calculated the mean taxable value of single family homes within a 0-5 minute walk of a residential treatment center, and also for within a 5-10 minute walk of a treatment center and for within a 10-15 minute walk of a treatment center. As hypothesized, single family homes that were the furthest distance from a residential treatment center had the highest mean taxable value. Note: Single family home mean taxable home value is not shown in Fig. 2.

Figure 2.

Figure 3.

 
 
 
 
 
Figure 3: Point locations represent WIC retail locations. One-, five- and ten minute walking service areas are drawn around each point location. WIC serves low-income pregnant, postpartum and breast feeding women, infants and children who are at nutritional risk. ‘Walk time’ rather than ‘drive time’ service areas are shown since low income women may not own or have access to a vehicle for transport.
Figure 4. WIC route analysis. Used ‘route analysis’ in Network Analyst to determine the shortest route (using time as the factor) for a truck to make deliveries to 22 WIC retail stores in Tacoma.
 
This figure shows the shortest route in terms of time (not distance) that a truck can take to make twenty-two deliveries to each WIC Retail store in Tacoma. I used ‘drive time’ in minutes and ‘distance’ for this analysis. Drive time (in minutes) is [length of segment]/[speed]*60 where the segment length is in miles, speed is in miles per hour, and there are sixty minutes in an hour. I did not define the order of all twenty-two stops for this analysis.

Figure 4.

Maps projected in NAD 1983 HARN StatePlane Washington South FIPS 4602 (US Feet).

Data sources: U.S. Census (American FactFinder, American Community Survey), Washington Department of Health, Washington State Geospatial Data Archive

©2016 Angela Vincent (All rights reserved)

 

Thank you to B. Christiaen, B. Fincher, M. Gonzalez, L. McKenna, D. Son, and C. Vincent for your review.

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