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Education in Photogrammetry on a lower level is given at the 
St a t'e""I^n's'ti t u't e^o f.-T-e oe"h n^i c a 1»"Eod^u.- 
cation ih Helsinki ’and at the T e-oc^h.n*i cia 1 
S eh 9:0.1.s..i;n.:.M iok k;e.l1.i1,. R.O.V.an.i.e m i and 
Vaasa during the second and third school year. 
Postgraduate additional education in photo interpretation was 
offered at several special courses mostly organized by enginee- 
ring organizations. 
Aerial photography 
  
Black-and-white photographic material 
During the last four years there has been a tendency to reduce the 
0, 
type collection of films, More than 80 % of black-and-white ae- 
rial photography was made on Kodak Tri-X-film, which has been 
used at all altitudes, The rest 20 % has been made on Ilford 
Aerial-N and HP-3 films, Kodak Double-X and Infrared Aerographic 
films, Agfa-Gevaert Aviphot Pan 33 and Aviphot Pan 36 films as 
well as Du Pont Cronar film. Aerial N film was mainly used at 
low altitudes up to 2000 m, Aviphot films were used at medium 
altitudes such as 4600 m. For high altitudes, often 9000 m, the 
Cronar film was used, 
Color films 
In most cases Kodak Ektachrome has been used, For false-color 
Kodak Infrared Aerographic film was employed and in 1971 the new 
Aerocolor Negative Film was also in use, 
Camera equipment 
For high-altitude flights (9000 m) there is a jetplane of the 
Air-Forces available, The other flights were made 
with two DC 3 aircrafts owned by the National Board of Survey 
and hired Cessna aircrafts, The private Engineering office 
Finnmap used its own Pilatus Porter aircraft. 
Most of the flights were operated with Zeiss West Germany came- 
ras RMK 15/23, Also the Wild wide-angle camera RC 8 and Zeiss