DeLorme Street Atlas USA 2009, Руководство пользователя

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Getting Started
7
• What is a map file?
Street Atlas USA lets you save all of the work you have done in the mapping
application as a single workspace so you can open it again later. These saved
workspaces are called map files.
A map file consists of the following items: coordinates of the map center,
current zoom level, current magnification, map display preferences, any
added items: such as draw layers, routes, and so forth. As you create new
routes or draw layers, change preferences or the map center, and so forth,
they are added to the current map file. Changes can be saved or discarded.
To learn how to create a map file in Street Atlas USA, see Creating and
Deleting Map Files on page 99.
• What do the different colors and symbols on the map mean?
The different colors on the map represent different areas of land use and land
cover (parks, population centers, water, forests, and so on). The Map Legend
provides examples and descriptions of the map features.
Click the Help button on the Street Atlas USA toolbar and click Map
Legend to display the Map Legend Help topic. You can view the Map Legend
for all map features on the map or view the legends for individual feature
categories.
• What's the difference between a stop and a via?
When routing in Street Atlas USA, you have the option of adding/inserting
stops or vias in the route. A stop is a location in the middle of a route where
you want to stop and then proceed from. A via is a road on the map that you
want to specifically use when routing.
• What's the difference between adding and inserting a stop or via?
The Insert Stop/Via function arranges stops/vias geographically in the route.
The Add Stop/Via function adds stops/vias in the order you add them to the
route.
• Why does my route fail to calculate?
Your route will fail to calculate if you create a route:
• With a route start, stop, via, or finish point in an area that you have
designated as a Route Avoid.
• That includes route points outside the United States, Mexico, or
Canada.
• On an island without roads. In this case, Street Atlas USA will look for
the nearest road to that island to place the route point. If the nearest
road is not routable (for example, it is the only road on the island
and/or the island does not have ferry access), you will get an error
message saying "Route failed to calculate."