6B-2-3 
List 1 Example of vector data for road. 
rclass c r_no 1 rname sample 
mode I noma I 
width 7. 20 
center whiteline 
rIine 1 
R_p width 1.5 mode I 1 
L_p width 1.5 mode I 1 
#data center p_way Xclass Xno XmodeI 
i 1 
i 2 
i 3 
x 4 n wn c 3 1 
i 6 
x 12 y In e 21 3 
Table 1 Heads of additional data. 
Head 
Contents 
r_c1 ass 
r_no 
r name 
r 1 i ne 
pway 
mode 1 
w i dth 
center 
R_p 
L_p 
Road class 
Road number 
Road name 
Numbers of lane 
Existence of sidewalk 
Shape of base road 
Road width 
Shape of centerline 
Definition of right sidewalk 
Definition of left sidewalk 
In fact, the coordinate for 3D model is 
calculated by these data in modeling the road. 
Example of calculation in simple road model is 
shown in Fig.3. Let a straight line p-q through a 
point ‘ a ’ and falls at right angles with a-b. We 
can get the points ‘ c and ‘ d ‘ away from a 
The distance between ‘ a ‘ and ‘ c ‘ (or ‘ d ‘ ) is 
road width ‘ r ‘ defined in additional data. A 
formula is shown by (1). We can get ‘ f and ‘ e 
‘ about a point ‘ b ‘ same as before. ‘ g ’ , ‘ h ‘, ‘ i 
‘ and ‘ j ‘ are given by these calculated points. 
Thus the coordinates consists of road are 
defined. 
Fig.3 Coordinates of road in 
calculation. 
x c=x a -A(y b -y a ) 
y c =y„+A(x b -x a ) 
X d = X a + ' l G\ -Ve) 
y4 =y<,- À ( X l, ~ X a) 
X - r 
-jO 2 -*J 
Generally, the road is rarely straight and a 
winding road is popular in most cases. In 
modeling road from the information of vector 
data and road width, we need to make the 
polygons that fill an opening in the corner 
shown in Fig.4. 
Calculate the cross-product of road’s vector 
shared with the coordinates in corner to 
determine disposition of polygons that is placed