The main information contains e.g. the co-ordinate system 
used, the sequence of co-ordinates, the producer and 
receiver of data and the time for generation of data. 
Furthermore, it is possible to inform of the covering of 
area by means of map sheet number and by stating 
minimum and maximum of co-ordinates. 
E.g. 
20H3 YXZ 
^ 
sequence of co-ordinates 
definition of sequence of co-ordinates 
main information 
command separation character 
In the object code the classification of the physical object 
you want to describe is stated. The DSFL-format is built 
up hierarchically with classification in divisions and sub- 
divisions. 
E.g. 
YoKG4 %U1 
E: buildings by rouf line 
subdivision 
command separation character 
buildings and constructions 
  
topology 
  
division 
  
command separation character 
In the localization geographic data are stipulated either as 
a point, a line or an area. As regards lines and areas you 
may state straight lines, splines, arcs of circles and clotoi- 
des. 
E.g. 
%L1KR 123617.42 76212.19 21.12 
|: co-ordinates as stated in %H3 
straight line 
stated by co-ordinates 
start of a new object 
line 
  
command separation character 
After the statement of a localization it is possible to 
continue with a new localization of the same object, e.g. 
because it proceeds from a straight line into a spline. You 
can also continue with the localization of a new object with 
the same object code, or you can start all over and state 
a new object code. 
Data are terminated by the command %S. 
Since then the DSFL-format has developed and today has 
the following structure: 
Main information 
Reference definition 
Object code 
Localization 
  
In a reference difinition, immediately after the main 
information, it is possible to state information which later 
can be referred to. Typical is information of different 
accuracy groups where in the reference definition a close 
description of accuracy is given, whereas later on you only 
refer to the number of the accuracy group, to which the 
data belong. Another typical piece of information under the 
reference definition is the description of reference points, - 
lines and - areas. In this way it is e.g. possible uniquely to 
express that the same point appears as a punctiform object 
and at the same time is part of a linear object. 
102 
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