33. Istanbul 2004 
shes are defined. 
manner like the 
ited as well as the 
e only with one 
ecially dams and 
is recommended. 
1 second iteration 
sults in the forest 
uenced. 
  
r a sequence of 
he file rascor.dat 
ling as batch job. 
F HANNOVER 
'AL TERRAIN 
NAME 
grid.dat 
VN 
A daxyz.dat 
NTS 
williamstown- 
DES (2) 
(N) 2 
' FILE 
ONE LINE 
oz 
(E) E 
N=NO 
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004 
  
6 FLAT (F), ROLLING (R) 
OR MOUNTAINOUS (M) F/R/M R 
7 NUMBER OF ITERATIONS 1/2 2 
8 USE MODE CHANGE UP/DOWN Y/N Y 
9 SMOOTHING AFTER FILTERING 0 =NO 
FINAL FILTER - SIZE 0/3/5/7/9 0 
11 OUTPUT FILE FOR LISA Y/N N 
12 FURTHER HANDLING D = DIALOG 
A=AUTOMATIC = NO FURTHER DIALOG D/A 
PREDICTION YES/NO DY/DN/AY/AN AN 
13 SIMPLE / ENHENCED FILE INPUT S/E S 
FILE NAME = BLANK = NO CREATION OF FILE 
TYPE CODE AND FILE NAME IN ONE LINE 
DEFAULT = NEXT INPUT 
Final results: 
384523 OUTPUT POINTS ( 65.10 %) INCLUDING 
SPECIAL POINTS 
206165 POINTS NOT USED ( 34.90 %) 
END OF PROGRAM RASCOR 
Results of program Rascor without consider break 
lines : 
Final results: 
301908 POINTS NOT USED ( 51.11 %) 
Program RASCOR creates an image situ.raw with the location of 
the remaining points. If a break line file will be used, situ.raw will 
include an overlay of the break lines (gray value 0) and the 
remaining points (gray value 120). 
t 
    
    
Za M e rx 
Figure 8 file situ.raw — remaining points, without break lines, 
      
ue. AS DR 
cA I ks = 
ET eR 
id 7 PEE oer 
iuo tr Be ORA dels 
Figure 9 file situ.raw — remaining points, with break lines, 34,9076 
of points removed 
The break lines can be modified by operator . 
The file wich contains the coordinates for the break lines can be 
modified with a text editor. 
The following example shows the structure of this file. Break lines 
are coded with 0 and 1 values which represent the start and the 
end of a break line. 
# Design File Name = c\temp\**** dgn 
# Feature Type = Break lines 
ZINDEX HEADER X Y Z 
26101 352073.824 331166.299 171.781 
26101  351941.001 331016.496 168.652 
added break lines start here. 
30000  356751.300 319548.010 
30011  356907.460 319552.770 
30021  357891.270 318959.360 
30160  361888.980 317491.460 
30071  357141.700 319740.170 
30081  358125.510 319037.440 
The following images shows the influence of the added breaklines. 
LUE T x 
     
   
= = 
Figure 10 Fewer points are removed 34,82%. 
PROGRAM LISA 
LISA-BASIC is a general DEM-program. Based on 
random or equal distributed height points, supported by break and 
form lines an equal distributed DEM can be created. Internally the 
DEM is handled as an image with grey- instead of Z-values. This 
has the advantage of a very fast computation of all derived 
products like contour lines, wire frame models or 3-D-views. 
An example of difference is marked with yellow.