endlap is being chosen as 60%, it is considered proper to
make the ideal endlap by the developed photography system
of radio-control as 60%.
4. APPLICATION
4.1 OBJECT AREA
The object area is that the longitude is E 127° 23’ 00”
and the latitude is N36° 22° 00” . Then, we chosed the
object area as the existing 1.2km asphalt pavement. The
chosen area is the asphalt pavement to link Cheonmin-dong
and Kwanpyoung-dong in Taejon city of which the width is
about 3-5m and which is not straight. Then, it is in the
state that the passing quantity of cars is much and the
damage is serious. The starting point of planned construction
is a bridge to cross Honam Expressway(Toplib Bridge), and
the terminal of construction section, 1 bridge(Pyoungsan
Bridge) is being included, and the ground height difference
of whole section is about 30m. The planned alignment line
chosen in this study is consist of private forest, private
paddies and dry fields, and national land.
L^ Sara PRE Z whet | : J
^ *r ; "d : Mane 7 9 Wd |
2 2708 AES faïna C2 Ups t L^ ton 3
VE ( ENN Gr SAR:
A NN | Pilas 6.1 9/7 vo:
Figure 5. The scheme drawing for photography
As for the used film, we used ASA 400 Kodak Slide Film
from the result of basic study. And, we photographed by
fixing the shutter speed as 1/500sec and the f-stop as f/16.
So as to acquire the plan and profile map of scale, 1:1200
which are the demanding drawing of execution design, we
photographed 28 sheets of photos by planning with 3 strip
in consideration of the feature of area which is experiment
object, and the scheme drawing for photography is like the
Figure 5.
For the manufacture of cross-section drawing and
structure drawing that the drawing of largely scale is
necessary, we photographed by lowering the flight height
partially. From the viewpoint of feature of the photography
434
system, it was difficult to maintain the exact endlap. But,
we photographed by maintaining the endlap as about
60-70% and the sidelap as 25-35%. |n the photography for
mapping, the covering area of 1 photo on the ground is
about 306 204m and the base line for photography is
about 120m, and the distance between strip was about
160m.
As for the ground control point, total 32 points were
used. And some of them are the points that ground targets
were installed. And the rest was the natural point which
was photographed in photo clearly. ^ About the decision
method of 3 dimension coordinates of the GCP and the
decision of exterior orientation parameter, this paper
performed with the method which is same as the method
of position decision of GCP in the basic experiment.
4.2 DATA ACQUISITION
We made out the digital topographical map with the
method to make into analytical plotter by compensating the
systematic error of photographed photo and by using 3
dimension coordinate and photo coordinate of GCP, and
treated by classifying into plane data and altitude data. On
the topographical map, we marked the matters about the
examination of the present situation of road by recording
existing road position, road width and size of structure etc.
exactly. And, so as to extract the result of site
measurement and the present situation of land use on
computer, we made into digital data by digitizing the
cadastral map about alignment line. About the DTM to be
able to use for calculating the important data of road
design such as profile, cross-section, and calculation of
earthwork volume etc. by digitally expressing the feature
about topogrphy, we extracted it by using PA2000
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Figure 6. Contour map of object area
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996
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