rior to presenting the report on progress during the pe 
: : aR, oo > 
g" has now been replaced by "data 
day's sensors consist of digital 
s therehy facilitating a sub- 
Of th nformation obtained. This type 
   
sequent data 
of acquisition and automatic processi ng will become more and 
^ j 
    
i 10! p 
more important ; ci ote sensing techniques, which now 
occupy a large part of the ISP activities. 
On the other 
mapping are 
photo OLY rammetric methods for 
1s a clear tendency 
    
since the most modern metri 
 PHOtORTEDMy Teer ; s a result of improved cameras, 
Jet airs raft and hj efinition film. Improved quality of the 
lour-infra film has also made it possible to extract additio- 
Ms information from high altitude photographs. Further, the 
optical distortion, which previously was very difficult to master, 
has now been considerably reduced, 
cameras show a radial distortion of about 2-5 um over a large 
part of the image field and an improved colour-correction. How 
ever, other forms of " 
earth curvature and refraction. The 
  
las 
larly affect photography at higher altitudes. Fortunately, the 
sources of error can be eliminated by the use of compensation 
r f v 
n 
plates on the stereo autographs 
compensated for by using analy 
To facilitate strip navigation for mapping missions,'aireraft 
sights have been constructed for visual navigat ion, when re.i- 
able topogr Other more sophisticated 
types of 1 as Doppler systems, are 
now widely | are not available. Reli: 
  
art amatı 
a LA U O ma L 1 e 
market, 
uod . 
mag + was 23101 “NTT TT , + h 
positives and P rin t S » vn 
as essing with 
iA (11 Film instead of glass 
now except f 
      
ouble shooting sys 
easily produced by means of colour analyse | 
lators and au | filtering. colour diapositives are more a 
  
  
ras 346 A Te) 2 nof um 435 s ; aithnion *ho 
more used for ing and photo interpretation, although the 
; 
1 : v ne CQ Liv + 
production is still rather expensive. 
Ç : 
mary, several sources of error in 
  
l 
turn shown up 
A +“. sax c RC s ld > pr + N Je t S imm 
other problems wi n new fields of the pnot 
  
sensitometric 
S rio 
of the present situation 
c 
cm 
; towards 
distortion" occur, such as film shrinkage, 
f last two components particu- 
Se 
photography are also on the 
OQ 
have now been eliminated or considerably 
ithi