35100 
  
ost 
  
  
  
  
  
  
lanting sunlight 
results. That is 
taken, where by 
ew even more 
refore, in most 
hs alone is not 
dditionally to be 
is made by 
which is a very 
For this reason, 
; c=60 and 80 
^hotogrammetry 
st-field and the 
er results, the 
d for us and 
ct the distortion 
lated (Figure 4). 
ith a pixelsize 
6 
between 10 and 25 cm, corresponding to data between 
20 and 80 MB. They can be handled by a PC and the 
pixelsize coincides with that from geomagnetic pictures, 
which is a reasonable basis for a combination of both. 
Practically, the photographs are scanned with 600 DPI. 
The orthophotos are calculated by SCOP on a Pentium 
100 with 16 MB RAM and two 700MB Harddisks. The 
resulting image is outputted on a HP DesignJet 650C, 
which is a 600 DPI Ink Plotter for AO paper format. The 
data are stored on CD Rom, where one CD can hold 
about 650 MB of data, which is equivalent to two or three 
projects. 
After the application of image enhancment procedures, 
the interpretation can be checked and improved (Figure 
4). 
3.3 Combination of Data and Visualization 
The combination of the orthophoto and vectorized data as 
well as the combination of the orthophoto and 
geomagnetic results is done using Arc Info 7.0. It is 
running on a Sun Sparcstation with 64 MB RAM within a 
local network. 
Pe 
t 
    
Figure 5: Puch, Lower Austria; Orthophoto with overlaid contour lines and geomagnetics 
127 
Figure 4: Zwingendorf; Orthophoto with overlaid 
interpretation (see also Figure 3) 
The orthophoto is overlaid with all the other information 
as the land register, contour lines or interpretations; in the 
composite image, new details, contributing to a better 
understanding of the archaeological site, can be seen. 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996