Running the Network Allocation Model

One of the advantages of creating a network allocation model via the Network Analyst extension is the ability to run the model multiple times while making small adjustments in between. In this activity, you will run several models, adjusting the parameters each time.

An image of the Solve Button for the location-allocation problem
The Solve button, located on the Network Analyst Toolbar will run the model currently loaded in the Network Analyst Window.

For the first run of the model, all of our parameters were set in the previous steps. To run the model currently loaded in the Network Analyst Window, click on the Solve button in the Network Analyst Toolbar.

When the Network Analyst completes the first run, it writes the results into the temporary memory layers in the Table of Contents.Take a moment to inspect the results.

An image of the Network Allocation Results
The lines radiate outward from the chosen facility to the demand points that can be reached within two minutes. The image may not match your data exactly as the data is updated by the instructor over time. Click to view a larger image.

Of the proposed locations, you should see three fire stations chosen. Each of the three chosen locations has lines radiating outward to demand points within the two minute travel time window. It is a useful visualization for determining the extent of a two-minute time window.

Open the attribute table from the Facilities layer in the Table of Contents. Use Select by Attributes to select the records with a Facility Type of Chosen.

An image of the Demand count and demand weight in the attribute table
The image may not match your data exactly as the data is updated by the instructor over time.

Open a blank excel workbook and create a table recording the following results from your first model.

  • The name of the three chosen locations
  • The demand count for each location
  • The demand weight for each location

Title the table, Two-minute Maximized Coverage. An example table is shown below. Actual results may vary.

Two-Minute Maximized Coverage
Location Demand Count Demand Weight
Sunset Fire Station 57 83
Samoa Fire Station 70 117
Hiller Fire Station 120 205

Save your excel file in your final folder for later use.