the made from the aerial 
photographs. 
shows 
photo-mosaic 
  
Fig.3 Photograpling scene 
  
Fig.4 Photo-mosaic from aerial photographs 
4. Drawing Up of Fireworks Viewing Area Map 
During the drawing up of the maps, firstly, definition 
on the fireworks viewing area map was given and some 
rules for drawing up of the map were decided. Secondly, 
an experimental map was drawn up following the rules. 
The experimental map was drawn up before the open 
day of the fireworks display festival. In the third step, 
verification of reliability for the experimental map was 
done by some students on the day of the fireworks 
display festival. In the final step, the fireworks viewing 
area thematic map was drawn up. 
The items in each step were carried out as follows: 
4.1 Definition on the fireworks viewing area map 
Fireworks viewing area map is a map showing the area 
where the fireworks can be seen well. 
306 
4.2 Policy on drawing up of the map 
1) The area where fireworks can be seen well is a zone 
where can be seen all the shot up fireworks and within 
about 2km from the launching site of the fireworks. 
There we can get a view of distant small fireworks, 
which is not a good area for a fireworks viewing area. 
The numerical value of 2km should be decided by the 
scientific method,however it is very difficult, so its 
value was decided by empirical knowledge in this 
paper. 
2) The treated area is within the limits of Narashino 
ity. 
3) The area where the citizens have not access, and 
unsuitable areas i.e.,cemetery, etc.is not a fireworks 
viewing area even if the fireworks could be seen. 
4) Visibility from windows of buildings excluded, and 
visibility only from the ground included. 
5) The fireworks viewing area needs to be confirmed in 
either of photographs taken from a height of 100 m, 120 
and 150m of fireworks display. 
4.3 Drawing up of the experimental map on the 
fireworks viewing area map 
The areas from where fireworks can be seen well was 
drawn up on a topographic map drawn on a scale of 1 - 
2.500 under the provisions of the above policy by 
manual utilizing oblique aerial photographs taken from 
the height of the spot for fireworks display. The size of 
the used photographs were approximately from 12X 
8cm to 25 X 20cm. 
4.4 Verification of reliability for the experimental 
map 
The reliability on the experimental map was checked 
by some students at 13 spots for the experimental map 
at the day of the fireworks display festival. The 13 
spots are shown by white and black circles symbols in 
figure 5. The pairs of students were stationed in their 
respective posts at the spots from where fireworks can 
be seen and from where fireworks can not be seen. 
Each group of students checked whether or not 
fireworks can be seen in concert with each other. 
Four parties of pairs were made, and they moved to 
several spots after investigation for some time at one 
spot. The head number of circle symbol in figure 5 is 
the party's number. The results of the check were filled 
in on the data sheet with times. Furthermore, the 
students who were in sight of fireworks took as many 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996 
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