SSFF 
SVENSKA SÄLLSKAPET FÖR 
FOTOGRAMMETRI OCH FJÄRRANALYS 
SWEDISH SOCIETY FOR 
PHOTOGRAMMETRY AND REMOTE SENSING 
NATIONAL REPORT FROM SWEDEN 
Dr Anders Wellving 
Survey Department 
Municipality of Linköping 
S-581 01 Linköping 
ABSTRACT 
A description of the most significant 
developments within the fields of 
photogrammetry, remote sensing and 
related GIS-activities during the last 
four years follows. The report is a 
compilation of contributions to a 
conference in Sweden in February 1992. 
The papers covered activities related 
to each of the seven commissions in 
ISPRS. The whole document is available 
(in Swedish) from the Society of 
Photogrammetry and Remote Sensing, 
KTH, 100 44 Stockholm. 
COMM I: PRIMARY DATA ACQUISION 
Activities related to this commission 
have been rather extensive during the 
last years. One of its working groups 
has been chaired by Hartmut Ziehmann, 
who is employed by the Technical 
College of Stockholm. Significant work 
has been done specially in the fol- 
lowing fields. 
- Development of improved methods for 
precision correction of satellite 
imagery at Satimage AB. 
- Preparations for and use of the 
radar sensor of ERS-1 launched in 
1991. The work has been performed at 
SMHI, CTH and FOA (abbreviations are 
explained in the end of this paper). 
48 
- Introduction of systems for pro- 
cessing of data from weather satel- 
lites at SMHI. 
- Introduction of GPS for positioning 
during air photo missions at LMV. 
- Development of a scanning laser for 
batymetric purposes (measuring of 
water depth) at FOA. 
Several other achievments could be 
listed here as well. 
COMM II. INSTRUMENTS FOR DATA REDUC- 
TION AND ANALYSIS 
Sweden has invested a large amount of 
money in the receiving staion for 
satellite data in Kiruna north of the 
polar circle. Landsat, SPOT, ERS-1 and 
MOS (Japan) imagery can be landed 
there. The development of the ground 
segment is still going on. 
SMHI has aquired technology for re- 
ceiving Meteosat and NOAA data. At 
SMHI a network of radar sensors for 
forecasting weather locally has been 
built up. 
During most of the period image pro- 
cessing hardware for primarily remote 
sensing purposes have been developed 
by three different companies  (SSC, 
Teragon and Context Vision). Due to 
declining market for dedicated image 
processing systems the production has 
finished at all companies. 
Concering stereo instruments it was 
reported that the number of analytic 
plotters has increased from 17 to 40 
during the last four years (mostly 
Zeiss). The area of applications has 
become wider and connections to GIS 
and CAD more common. 
COMM III: MATHEMATICAL ANALYSIS OF 
DATA 
A limited number of research project 
have been performed at a few insti- 
tutions. These can be grouped into 
five cathegories. 
- The image as an information system. 
Projects were done at FOA, KTH and SU. 
- Automatic registration of objects. 
KTH and FOA. 
- Interpretation and collection of 
thematic information at several uni- 
versities. 
- Knowledge based systems for ex- 
traction of information from images. 
KTH, FOA, SU and LBU have been active. 
- Weather forecasting based on remote 
sensing at SMHI. 
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