Hands On Solving and Analyzing OD Cost Matrix Results The three matrices are now ready to solve. 1. In the OD Matrix group, right-click on the matrix for Station 71 and select Solve. Under Destinations, Lines will be populated. 2. Right-click on Lines, choose Properties, and use the General tab to rename it Station 71. Using Properties, also change the line width to a three-point width and apply bright distinct colors. 3. Repeat this process for the Station 74 and 76 matrices. 4. Save the map document again. This exercise builds two-node vector lines that show the connection between a fire station and its trial run points. Network Analyst actually posts the shortest travel time and route distance in the Lines table. Although the route is represented by a straight line, it actually follows the fastest network. 1. Under the OD Cost Matrix group, rightclick on the Lines solution for each station and open its attribute table. Stack the tables. Select the four-minute records for each station by querying out records with Total_Minutes less than 5.0. 2. To quickly tabulate and display statistics for each station's four-minute runs, locate and right-click on each table's Total_Minutes field and choose Statistics. In the Selected Fire Stations table, select the only record for Station 71. In the Trial Runs table, use an attribute query to highlight all 22 records for Station 71. In the Load Locations dialog box for Selected Fire Stations, set Sort Field to INDEX, set the field for Name property as LABEL, and under Location Position, choose Use Geometry and specify 500 and Feet for the search tolerance. Right-click on Destinations, choose Load Locations, and select the 22 records for Station 71 selected in the Trial Runs attribute table. In the Load Locations dialog box, set Sort Field to INDEX and the Name property field to LABEL. Under the OD Cost Matrix group, right-click on the Lines solution for each station and open its attribute table. Stack the tables. In the Network Analyst window, load the locations in the OD Cost Matrix for Station 71 by right-clicking on Origins and choosing Load Locations. Continued on page 54 www.esri.com ArcUser Spring 2009 53