TRANSCAD教程2：The Miasma Beach Transportation Model

  Add Layer button. On the File Open box, open the Geographic File of TAZ.DBD. You should now see the TAZ layer being added to your map but some parts of the TAZ layer seem to be displayed outside of the window. Go to Map / Scale. On the Map Scale dialog box, select Show the Entire Layer of TAZ and Selection Set All Features.

GIS Concepts

Working Layer (or Current Layer)
When you have more than one layers in your map, there is always one layer designated as the Working Layer (or Current Layer). All the manipulations on the map (such as labeling or querying) apply to the working layer only.

Exercises:

• Ask transcad to draw TAZs before the Highway/Streets network.
  (Hint: Move Up and Move Down in the Layers dialog Box)
• Ask transcad to drop the streets from the map and add it back again
  (Hint: Drop Layer and Add Layer in the Layers dialog Box)
• Label each TAZ with its ID and street with its name
  (Hint: switch the Working Layer between Highways/Streets and TAZ and label each layer)

Examine the Map
Examine the map and compare it with Figure 1. Familiarize yourself with this map and the characteristics of the various link, node, and zone attributes.

1.1.3 Save the Map
After you set up the display of the map to the way you want (which should be labeLED properly), go to [Page]File / Save As. On the Save As dialog Box, select the drive and directory where you store your files. Select Map File under the List Files of Type

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