11 
The Orthophotomap as.a Resource for the Highway Data-Bank. 
  
It has been shown in Germany that aerial photography and 
orthophotomaps are useful as a medium for obtaining data 
for the establishment of a road data-bank. Up to now this 
use has been limited to identification and location of 
new highways which have not been incorporated yet in the 
official maps. For this purpose only the revision of the 
topographic maps at a scale of 1 : 5 000 in a whole pro- 
vince was carried out, with the help of rectified aerial 
photographs. In another province the orthophotomap 
1: 5 000 was published as an additional preliminary 
edition of the official line map 1 : 5 OOO and is to be 
brought up to date periodically with the help of new 
photo-flights(Ref. 4, 11). 
The same orthophotomap is suitable also for highway lo- 
cation (see Appendix 1). So far insufficient attention 
has been paid to the many possibilities of obtaining 
information for the establishment of a road data-bank 
using aerial photographs and photomaps. The possibili- 
ties of simultaneous interpretation, measurement and 
digital registration of data combined with descriptive 
information offer many advantages for this purpose which 
so far have been hardly recognized. The same will be 
valid for the establishment of municipal data-banks.