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Visual estimation for
horz. & vert. distances
is usually good enough
in terms of accuracy.
To operate the grid
mapping utility, you
will need a measure-
ment device - anything
from a depth sounder
to a ruler, your own
sense of smell or your
ability to make visual
observations. You will
also need a compass.
22
Vert. Distance: Vertical distance to the feature from your
current position ("0" if the feature and yourself are at
the same elevation -on a flat area). Enter a value for
Vert. Distance as described above for Horz. Distance.
When you are done, press ENTER again.
- Then press ESC to return to the Logging screen. This
writes the offset into memory, but you can edit it later
if you like by going through the same process.
Note: Offsets to area features are applied in
MobileMapper Office and not in the receiver.
10.Logging GIS Data on a Preset Grid Feature
The MobileMapper Pro's Grid Mapping Utility is an easy
way to automatically set up a series of GPS waypoints to
facilitate the logging of data in an orthogonal grid. This
utility assures that you gather measurements made using
field sensors such as chemical detectors, depth sounders
and magnetometers at an evenly distributed set of loca-
tions. This in turn assures the creation in your GIS of con-
tour maps with a prescribed density of data and without
any gaps that might force you to return to the field.
The Grid Mapping Utility deals with two different grid con-
cepts: grid features and grid points.
- Grid features are arrays of uniformly spaced waypoints
oriented in rows and columns
- Grid points are navigation features similar to way-
points.
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