The problem:
- My map is open, but there's nothing on the screen
- One of the layers in my map is missing from the drop-down
list
- I can't see any of the features in the layer I just added to
my map
Why it's happening:
Maptitude has a feature called autoscale,
which displays each layer automatically within a range of map scales. The geographic files
on the Maptitude CD-ROM already have autoscaling built in.
The scale of a map shows the relationship between distances
on the map and corresponding distances on the earth. Maptitude treats map scales as
ratios. For example, a scale of 1:1,000 will show every feature on the map at one
thousandth of its actual size. When autoscale is enabled, Maptitude checks the scale each
time a map is drawn and decides whether each layer should be drawn. If the scale is
between the smallest and largest scales that have been set, the layer will be drawn. If
the scale is not between the smallest and largest scales, the layer will not be drawn and
will not be available from the drop-down list, even though it is part of your map.
The autoscaling feature allows you to set up a map so that
more detail is shown as you zoom in, and less detail is shown as you zoom out. This makes
maps more readable by preventing too many features from being drawn in too small a space.
If you have an entire map of the U.S. displayed, autoscale automatically hides the streets
layer for a cleaner look. As soon as you zoom in enough that the scale ratio for a layer
is between the smallest and largest scales you have chosen, the streets will be drawn.
What to do about it:
- Choose Map-Layers to display the
Layers dialog box.
- Select the layer you can't see.
- Click the Autoscale button.
- Click the Clear button.
- Click OK to clear autoscaling.
- Repeat steps 2-5 for any other layers you can't see, but
want to see.
- Click the Close button in the Layers dialog box when you are
done.
Maptitude redraws your map to display those layers you
cleared of autoscaling.
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