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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
Picture 3.1 stone |
San Mt.(right)
3.2.13 GPS mission planning
In this stage, the present condition of GPS satellites
arrangement and the work session is determined, which is
accomplished before the field surveying. GPS positions the
location by the satellites. So the arrangement of the satellites
affects the accuracy of this surveying very much. In this reason
GPS surveying should be carried out in the better arrangement
of satellites. It is possible to check the arrangement of satellites
by using the value of DOP. Generally if the value of DOP is
less than 4, it's OK. And if it is required to do more accurate
GPS surveying, it is good to do the surveying in the condition
the value of DOP is less than 2.
In the GPS surveying of this study, the work session was
determined in the condition the DOP value is 'below 2' which
is set to the standard.
The figure 3.2 shows the present condition of the satellites
arrangement to do the GPS Static surveying.
Visible Satellites :
z
o
UTC Time : 2004/02/04
huit RSA MF PTR BURG Fr RN D HET ten Wed
DOP Plots
1
à
*s p RADEON LE IE ane Wes dg
Mike LAG. a! A cM die d BEEN
TEEU. 4€ WUPE. . . Deoa. C PRORA ovas ur Tire eod
Figure 3.2 The situation of satellites arrangement
1217
The table 3.3 is the work session to have accomplished the
GPS Static surveying in this study.
Table 3.3 Session table
Sessi Receiver l|Receiver 2| Receiver 3 |Receiver 4| Receiver 5
ession :
Ant. Hight'Ant. Hight| Ant. Hight |Ant. Hight| Ant. Hight
; Um- |Bong-Lae| Whang- Keum- | Jang-San
Session 1 |,
Gaung Mt. Mt. Lyung Mt. | Ryun Mt. Mt. 1
8:30-- 9:30 |... 1.325 1.162 1:212 1.545 1.335 |.
Session 2 Um- |Bong-Lae| Whang- |Gwang An| Baek-Un
ie Gaung Mt| Mt. Lyung Mt. | Beach port
3 leo ^. :
um LME 3405 [24996 1.163 1.542 1.566
. . 3, | Da-Dae | Nam Bu | Whang- il Hedin
Session 3 port Min Lyung Mt. Wharf 1 Wharf 2
M ru 1.473 | 1444 1.153 1.583 1.557
3.3.1.3 GPS surveying
The third stage is for carrying out the GPS Static surveying.
Picture 3.2 The picture of GPS Static Surveying is performed.
GPS Static surveying has divided into total 3 sessions and
accomplished. In the first session GPS Static surveying was
done in the five triangular points. And in the second, third
session, the GPS control point surveying was done to do the
matching of Digital Map and Digital Chart.
The figure 3.3 is the GPS observed point to be carried out in
this study.
BONE A
P ANS
e
Figure 3.2 shows the part-look to carry out the GPS Static
surveying among work sessions.
La
