Hands On What You Will Need · ArcGIS Desktop (ArcView, ArcEditor, or ArcInfo license) · Microsoft Excel · ArcGIS Network Analyst extension · Sample dataset from ArcUser Online This exercise models data from Fire District 37 in South King County, Washington, and re-creates two analyses to validate the district's time-based network travel model using the ArcGIS Network Analyst extension's Cost OD (Origin-Destination) Matrix. Direction Straight Straight Reverse Right Turn Left Turn Table 1: Delay values Description From Local to Local Road across No Roads From Local to Local Road across Local Road From Local to Local Road From Local to Local Road From Local to Local Road Sec 0 1 30 2 4 To add these values to this project, type the values for these delay values into the Seconds field, or load a prebuilt XML time set from the \Utility folder created by the sample dataset archive. To load the XML file, click the Load From File button on the dialog box, navigate to \Utility, and select GlobalTurns_00_01_02_04.xml. The optimal values will post automatically. Turn window width can be changed interactively. After using the mouse to resize portions of the colorful azimuth graphic, reset or retype Width values (in degrees) to restore the defaults or reload the XML file. Click OK to close the Global Turn Delay Evaluator, click OK to accept the updated Evaluators, and click Next. Accept Driving Direction defaults and click Next again. A summary of the network dataset parameters that have been set appears in a scrolling window. Select and copy this text into a WordPad file. Name the file with the creation or last modification date and save the text file in the \SHPFiles\WASP83NF folder. Inspect this file carefully and observe the new global turn rules. Click Finish, then Yes to build the new network dataset. Once this is completed, close ArcCatalog and open ArcMap. Loading and Mapping Network Streets and Time Runs In ArcMap, open the FD37_SOC4 ArcMap document file located in the FD37_4 root folder. Inspect this map document. The data is very similar to data used in previous District 37 tutorials. However, in this case, only three stations appear. These stations were selected to show variety within the district. The project opens in Layout View and shows location, apparatus, and staffing for Stations 71, 74, and 76. The Time Runs layer, at the top of the TOC, does not have a valid data connection. At the end of this next process, that problem will be fixed. Station 71 is an engine/squad station with five on-duty personnel. It is located just south of the Kent downtown area. Station 74 includes a ladder, a squad, and a battalion chief (six personnel), located on high ground in eastern Kent. It is situated on an arterial street and much of the surrounding land use is residential. Station 76 is a three-firefighter engine station located in the northern Warehouse district. 1. Before adding data to the project, confirm that the Network Analyst extension is available and its toolbar is visible. 2. Open an empty Network Analyst Window. Click the Add Data button on the Standard toolbar and navigate to \SHPFiles\ WASP83NF. 3. Load the network dataset streets_nw_ ND. When prompted, do not load other participating feature classes. 4. In the TOC, drag streets_nw_ND below the Network Streets and turn it off. 5. Navigate to the \DBFFiles folder and load Trial_Runs_1.dbf. Continued on page 52 ArcUser Spring 2009 51 www.esri.com