TRANSCAD教程2：The Miasma Beach Transportation Model

Click the Add Field button again. Enter the following:

1. Name: BA_TRAVEL_TIME
2. Type: Real Number
3. Width: 10
4. Decimals: 2
5. Uncheck the box in front of Index
6. Click OK.

You should now see two empty fields AB_TRAVEL_TIME and BA_TRAVEL_TIME being added to the dataview. Highlight AB_TRAVEL_TIME by clicking at its column heading. Go to Edit / Fill... . On the Fill dialog box, select option Formula. On the Formula Box, build the following formula:

(H_DIST / AB_SPEED) * 60

Click OK on both the Formula and the Fill boxes. Note the values being filLED in the AB_TRAVEL_TIME field. Pick a few links and verify that the values are correct. Repeat the same procedure for BA_TRAVEL_TIME with the formula:

(H_DIST / BA_SPEED) * 60

1.5 Enhance Miasma Map

1.5.1 Select Color Themes
With the Highway/Streets layer active, follow transcad instructions (pg. 149-158) for establishing the following link color themes:

     1. Freeway        = Red        6. Local Street    = Light Blue

     3. Primary Artl   = Green      8. Freeway Ramp    = Purple

     4. Secondary Artl = Blue       9. Cntrd Connector = Yellow

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Select line styles which will also distinguish link types.

1.5.2 Create Layout
Follow transcad instructions (pg. 34-36) to create a layout combining maps and data views. Attach appr

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