Thales Navigation Mobile Mapper - Manual (Page 19)

13
4. Logging and Describing an Area Feature
Basically, you use the same procedure as when you log a
line feature, especially regarding the need for defining a
logging interval (see 3. above).
What is new when you log an area feature is that you can
use one of the following two methods:
- The first method should be used when contours of
areas are irregular. This method is similar to logging
a line area in that you have to move along the con-
tour, but you also have to come back to the start point
so that MobileMapper can accurately measure the
area.
- The second method applies to areas with regular con-
tours, i.e. those with straight sides. With such areas,
you just have to go to each corner of the area, make
static occupation there and pause the logging between
static occupations. MobileMapper will deduce the
area after you log the last corner and you close the
feature.
Use the same procedure as on page 11 when you choose
the first method.
When the shape of the area allows you to use the second
method, do the following after arriving at one of the cor-
ners and with the Attribute List displayed on your
MobileMapper:
- Select the name of the area feature from the list of
features and press ENTER. MobileMapper starts log-
ging the area feature.
- Choose a time-based logging interval (see explana-
tions given for a line area on page 12). This takes you
back to the Logging screen where the list of attributes
for the feature is displayed
- Describe each attribute by selecting or entering the
appropriate attribute value for each of them. (Note
that you have to do this only once, not on each corner
of the area.)
Irregular area
Regular area
Logging screen
The Logging screen also
displays the current
value of area measured
since you started log-
ging the feature, the
number of satellites cur-
rently received and the
current value of PDOP
(see also page 22).