Hands On ping tolerance to 50 map units. 2. To begin, use the Edit tool to select the Chuckanut Ridge Road, which is one segment. Next, change to the Split Tool on the Editor Toolbar. Move the cursor to the endpoint of Turn Chord 1 and watch the cursor snap to the vertex. 3. Left-click once to split the line. Reselect the uphill (longest) portion of the road and grab the Split Tool again. Break the road at the start of T2. Continue this process in an uphill progression. This makes fixing numbering errors easier. When finished splitting the road, save these edits. 4. The next step is numbering the curve segments to match the Turn numbers. This is a manual process. Open the Chuckanut Ridge Road attribute table. On the map, select the turn segment for Turn 1 and enter 1 in the highlighted record in the TURN_NO field. Proceed to select and number turns from Turn 1 through Turn 47 and do not miss any curves. 5. When finished, sort data by [TURN_NO] and verify curves 1 through 47. Now, use Calculate Geometry to recalculate the length of all segments in both U.S. Feet and U.S. Miles. As an additional activity, recalculate raw travel times [MINUTESRAW] for all segments. Save the edits, end the edit session, and save the map. Task 5: Joining Chord and Middle Ordinate Lengths and Calculating Turn Radii Before calculating the radius of each turn, the Turn Chords and Middle Ordinates tables must be joined to the Chuckanut Ridge Road segments. Then the CH_L_FT and MO_L_FT fields in the Chuckanut Ridge Road table will be populated with values. 1. Open tables for Chuckanut Ridge Road, Turn Chords, and Middle Ordinates and adjust the size of each so all are visible. 2. Right-click on the Chuckanut Ridge Road layer, choose Joins and Relates > Join and use TURN_NO as the field in this layer to base the join on, choose Turn Chords as the table to join to this layer and Turn_No as the field in the table to base the join on, and click on the radio button to keep all records. 3. Now calculate the length of all Turn Chords in the Chuckanut Ridge Road table. Use the Field Calculator to populate the Chuckanut_Ridge_Road.CH_L_FT field with the values from Chord1.Length_Ft. Then remove the join by choosing Joins and Relates > Remove Joins. Select Ridge Road, change to the Split Tool, click on the end point of the Turn Chord, and left-click once to split the line. Reselect the next uphill portion of the road, grab the Split Tool, and repeat the process. Continued on page 56 www.esri.com ArcUser Winter 2010 55