344 
Vector 
Raster 
Geometry 
S> ? 2 
o o o o o o 
o O O O o O 
o o o o o o 
P 1 
9 0 0 0 0 0 
Description 
of geometry 
r “1 
1 explicite | 
l 1 
implicite 
(co-ordinates 
from the order) 
Feature 
indirect 
(over references) 
i 1 
1 .. , 1 
| direct | 
1 1 
Continuous 
realization 
r l 
L P2 " Pl _| 
limit of 
digitizing 
Discrete 
realization 
digital straight 
line 
r~ 
listing of 
base elements 
1 
“1 
1 
1 
_i 
Operations 
- determination 
of length of 
curve 
I ¿n p i + i - p i h ! 
L_ 1 _! 
adding of 
direction codes 
- area of 
surfaces 
analytical 
calculation 
i 1 
1 adding 1 
I 1 
- superpositions 
analytical 
calculation 
simple value 1 
addition 
I 1 
I I favourably associated 
I 1 
Table 2: Comparing vector and raster representations