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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
record and the coordinate output by the network adjustment,
which was adjusted to Bong-Lae Mt. - Keum-Ryun Mt - Um-
Gaung Mt. That is the stablest in the geometric arrangement.
Node ax dy Jac «ay?
Jang-San Mt. 0.000000 | 0.000000 0.000000
Whang-Lyung Mt. | 0.000625 0.000001 0.000625
Keum-Ryun Mt. 0.000529 0.000016 0.000529
Bong-Lae Mt. 0.000000 0.000000 0.000000
Um-Gaung Mt. 0.000000 | 0.000000 0.000000
RMS 0.015194 | 0.001849 0.015306
Table 3.6 The difference between real coordinate and
coordinate in geometric arrangement.
3.3.2 Analysis of the accuracy according to the change of the
variance factor.
The variance factor(VF) used in the Chi-Square test of
goodness of fitness when the GPS network adjustment would be
done was divided into the value of 'out the effective range', the
value of 'within the effective range’ and ‘the more precise value
within the effective range’. In this condition the precision of
GPS observed value was made a comparative analysis.
1. Jang-San Mt.
0.4795<VF<1.7085 dx dy du + dr
VE-6.1733 0.000000 0.000000 0.000000
VF=3 2322 0.000000 | 0.000000 0.000000
VF-1.6216 -0.022000 | 0.005000 0.022561
VF=0.9364 0.000000 | 0.000000 0.000000
2. Whang-Lyung Mt.
0.4795<VF<1.7085 dx dy P ES + dy?
VF-6.1733 -0.024000 | 0.005000 0.024515
VF=3.2522 -0.018000 | 0.004000 0.018439
VF=1.6216 -0.019000 | 0.013000 0.023022
VF=0.9364 -0.024000 | 0.003000 0.024187
3. Keum-Ryun Mt.
0.4795«VF«1.7085 dx dy [ax + dv”
VF=6.1733 -0.023000 | 0.000000 0.023000
VE=3 2522 -0.017000 | 0.001000 0.017029
VE=1.0210 -0.025000 | 0.008000 0.026249
VF=0.9364 -0.022000 | 0.002000 0.022091
4. Bong-Lae Mt.
0.4795«VF«1.7085 dx dy L^ + dy”
VF=6.1/733 -0.000400 | 0.000100 0.000412
VF=3. 2922 -0.000400 | 0.000100 0.000412
VE=1 6216 0.000600 | 0.006100 0.006129
VF=0.9364 -0.000400 | 0.000100 0.000412
5. Um-Gaung Mt.
0.4795<VF<1.7085 dx dy | + dy”
VF=6.1733 -0.000300 | -0.000300 0.000424
VE-3.2322 -0.000300 | -0.000300 0.000424
YF-1.6216 -0.141300 | 0.222700 0.263744
VF=0.9364 -0.000300 | -0.000300 0.000424
Table 3.7 The error of coordinate with VF variation.
1219
The next is the investigation of the happened error followed by
the change of the VF which is the factor of the network
adjustment in the geometric network structure of Bong-Lae Mt.
- Jang-San Mt. - Um-Gaung Mt. The case of being included
‘within the effective range' has the less error than the opposite
case. In the case of being included 'within the effective range’
the more precise output of the coordinates was not possible if
the less value of VF was given.
4. CONCLUSION
For the results of this paper, 'Application of marine
geographic information system using analysis of control points
in postprocessing DGPS points surveying’, it is concluded as
following,
First, the variance factor(VF) used in the Chi-Square test of
goodness of fitness when the GPS network adjustment would be
done was divided into the value of ‘out the effective range’, the
value of 'within the effective range' and 'the more precise value
within the effective range'. In this condition the precision of
GPS observed value was made a comparative analysis. Here,
the case of being included 'within the effective range’ has the
less error than the opposite case. In the case of being included
‘within the effective range' the more precise output of the
coordinates was not possible if the less value of VF was given.
Second, when the Digital Map was matched with the Digital
Chart by using the coordinate of the boundary point through the
EDM was carried out in using the result of GPS surveying,
totally it is known that the errors were happened largely in the
southeastern direction. In the northern direction the error was
about 3.41m, in the eastern about 5.64m. So in the case of the
matching the Digital Map and Digital Chart, it is thought that
the closer examination and matching would be carried out.
Third, in this study, the 3 points selected as the control points
in adjusting the GPS network, the case of 'Bong-Lae
Mt.','Keum-Ryun Mt.',' Um-Gaung Mt.' has the least error. The
geometric arrangement on 3 points selected as the control points
was about 55°40' 02.98" , 48°28' 47.49" , and 75°51' 09.53". So
the more geometric strength approaches 60°, the more precise
coordinate result is output.
And the GPS and the EDM surveying done in this study was
carried out in the limited range. So it need the surveying and
analysis of the more observed points to get the more practical
result. Also, for the analysis of the statistical result of GPS
network adjustment and the performance of the study for the
matching the Digital Map and Digital Chart, the study of the
geographic information management for the unified geographic
information system construction could be activated and the
database structure, contents, and the integrated management
system must be researched more systematically.