Full text: XVIIth ISPRS Congress (Part B4)

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Under "state" it is possible to annex more descriptive data 
to the physical objects, classified under the object code. 
Typical information attached to a building might be 
municipality, name of a road and house number. 
Eg. 
%N 2 %B Accuracy group 
%D111 217 %B County/municipality number 
%D112 6919 %B Road code 
%D131 Snerlevej %B Name of road 
%D132 Sa %B House number 
%KG4 %U1 %B Building by rouf line 
%L1KR yl x1 zi 
y2 x2 22 
y3 x3 z3 
y4 x4 z4 
yl x1 zi 
%D %B Cancel all data fields 
It is'important, when annexing descriptive data, that you 
remember to cancel the descriptions, otherwise they are 
transmitted to the succeeding objects. If e.g. you did not 
cancel the descriptions with %D, and a new object fol- 
lowed, e.g. a lake, the lake would inherit the same descrip- 
tive data as the building, and that would cause nonsense. 
Under "state" there is a possibility of stating data in 
another data model than the object describing. By introduc- 
ing the idea "tables" it is possible to state relational 
connections, surveyors' data, digital high models and raster 
data. As a consequence, localization has been removed 
from the main structure, and has become something you do 
not need to use. 
As an example you can mention that it will now be 
possible, by means of the DSFL-format, to inform of the 
legal house numbers of each road in a municipality without 
having to state a geographic placing. 
You may say that earlier the descriptive data were linked 
to the geometric localization of physical object whereas the 
localization now has become descriptive data equal to the 
rest of the descriptive data. 
Under "state" it is also possible to transmit updating. 
Whereas formerly, when updating, all data were often 
exchanged once more, it is now possible to exchange 4 /- 
data. Updating is based on the following command 
structure: 
%AF %B Updating begin 
. the object to be updated is 
identified here 
%AT %B Updating to 
. the result after the updating 
. is stated here 
%AS %B Updating end 
In the new version of the DSFL-format, the format has 
been extended to being able to include "stupid drawings". 
It is now possible, to an object, to attach details of colour, 
line-type, etc. which normally are used at an outdrawing. 
Furthermore, object codes for map frames, grid points and 
other map frame information are introduced. Finally, an 
extension of the object codes and a strong revision of the 
text and some of the examples has taken place. 
These additions to the DSFL-format are the result of 
applications from the users who have expressed a wish to 
exploit these possibilities. It is my hope that it will be 
possible to keep the DSFL-format alive through the good 
cooperation between the users of the DSFL-format and the 
working group who develops and maintains the DSFL- 
format, until in the course of 5-10, years we will obtain an 
international standard in this field. 
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