Ee 
DS LES AIR SAINS OUEN 
  
Area: entire area of Switzerland 
Area covered: -42000 km? 
Ground height: ~400 - 4800 m 
Flying height a. s. 1: 4400 - 9800 m 
Camera: Wild RC30/20, 15/4 UAGA-F 
Photo scale: ~1:24000 - 1: 38000 
Forward/side overlap: 90-70%/40-30% 
  
  
Number of strips: 116 
Number of images: 7800 
Date of flight: June - October 1995 
Film: colour diapositive + infra-red 
Scanner: DSW200 
Pixel size: 25 um 
  
Table 1: Flight and block data 
of the entire block Switzerland 
3.2 Data production 
To satisfy the increasing need for just in time topogra- 
phical data and maps in the future, modern and efficient 
methods must be used for deriving spatial data. Using 
modern techniques and methods of digital photogram- 
metry, 3-D data and maps can be derived from up-to- 
date aerial images in an operational and highly auto- 
mated way. Therefore, some of the processes (e.g. 
image frame import, interior orientation, triangulation, 
DTM and orthophoto generation, etc.) will be perfor- 
‘med fully automatically or partly automated in a batch 
mode. The SWISSPHOTO production was divided into 
  
several processing modules for optimized organisation. 
The basic processing steps are summarized in the fol- 
lowing: 
e Scanning 
e Data Archiving 
Digital Aerial Triangulation 
» Automatic Digital Terrain Model Generation 
Automatic Digital Orthophoto Generation 
* Mosaicing 
e Data Management 
e Data output and transfer 
For the data production swissair Photo+Surveys Ltd. 
purchased digital photogrammetric equipment from 
Helava/Leica: two Digital Photogrammetric Worksta- 
tions DPW770 and one Digital Scanning Workstation 
DSW200. As computer platforms for these stations 
three SPARC Station 20/71 from SUN microsystems 
are used. For the test phase the software release SO- 
CET 3.1.6b (beta version) was used, while for the pro- 
duction the latest SOCET 3.1.1.2. version was imple- 
mented. 
The whole production of the data should be finished 
within the next two years in oder to provide up-to-date 
data for the users. In 1998 or 1999 Switzerland will be 
flown again to obtain new photos of the entire country. 
3.2.1 Scanning and data archiving 
All images are scanned on a Helava/Leica Digital 
Figure 2: Flight lines of project SWISSPHOTO 
188 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996 
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