DeLorme Street Atlas USA 2009, Руководство пользователя

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Street Atlas USA® 2009 User Guide
22
Measuring Distance and Area
Use the Measure tool on the toolbar to measure linear distance and area on the
map based on the units chosen in the Display tab of the Options dialog box.
The snap function snaps (attaches) the point of a measurement line to a point on a
road or another measurement object. This ensures a more accurate measurement of
distance or area.
The snap function is essential when measuring area. To measure area, you must
completely enclose the area by snapping your finish point to your starting point.
Notes
• The measure tool is the best way to measure short distances on the map. If you
want to measure the distance of a road, try creating a route. If you want to
measure a large area on the map, use the area object tools in the Draw tab.
• To disable the auto-snap function, hold down the ALT key on your keyboard
while using the Measure tool.
• Measure objects (lines and areas) are saved with the current map file. When you
create a new map file, the measure objects do not display. If you want the same
measure objects on your new map file, you must recreate them.
• To view information about a measurement line, right-click it and select Info
from the shortcut menu. The measurement information is automatically
displayed in the Info tab.
To Measure Distance or Area
Use the following steps to measure linear distance or area on the map.
1. Verify you have the correct units of measure selected in the Display tab of the
Options dialog box. For more information, see Setting Units of Measure
Preferences on page 85.
2. On the toolbar, click the Measure tool . The pointer changes to .
3. Click point-by-point to draw a measurement line on the map. A text box
displays next to your pointer indicating the total distance of the measurement
taken.
Note When you pass over a point in a road, measurement line, or
measurement area to which you can snap, a yellow circle defines the snap
point. Click to snap the point of the measure line to the road or measurement
object's point coordinate.
4. To end a measurement line, double-click the last point of the measurement
line.
OR
Click the last point of your measure line or area and then click the Measure
tool on the toolbar.
The measure line is a two-pixel wide yellow line and the total length of the line
is displayed in a label at each endpoint of the line.
5. To end a measure area, hover over the starting point until the yellow snap
circle displays, and then double-click the last point to the starting point. The
closure area is transparently shaded, and the area and perimeter
measurements display.