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For these purposes are used practically the same cameras, types of photography and photographic mate- 
rial, stereoplotters, correcting devices, signalization, field completion survey and amount of photointerpre- 
tation — photoidentification as for cadastral survey. 
Photo-mosaics and simple photo-maps are widely used for the purpose of planning and getting a general 
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survey of an area but also as an aid for the accurate survey with photogrammetry. 
4. Agriculture and forestry. 
The principal use of photogrammetry for agricultural and forestry purposes is the preparation of maps for 
'adastre and reallotment. Photogrammetry is however sometimes also used directly for hydrotechnical sur- 
vey and the preparation of special forest maps etc. 
5. Terrestrial photogrammetry. 
Terrestrial photogrammetry is seldom used and only for very special purposes. 
Germany reported on a. survey of some valleys in the Alps at 1:5000 (120 km? from 77 bases), on the 
survey of a dam-break for judicial-economical purposes, and on the survey for volume-determination in 
lime-stone and brown-coal mines. 
Switzerland reported on the survey of special things as glaciers, traffic accidents etc. 
6. The tendency of development. 
There is an obvious and general confidence for photogrammetry as to accuracy and economy. Photogram- 
metry is being widely used in order to diminish the field-work, which belongs to classical geodetic me- 
thods. Photoidentification and photointerpretation is being used as a step of photogrammetric survey. Pho- 
togrammetry is being used for accurate and very large scale mapping as at 1 : 500. It is being combined 
with automatic coordinate registration and high speed electronic computors. This numerical and analytical 
photogrammetry is being used for reallotment and engineering projects. It is a trend to use stereocom- 
parators for analytical photogrammetry, first order stereoautographs for precise graphical plotting and 
accurate second order autographs for topographic graphical plotting. Wide-angle aerial cameras 15/23 cm 
is being more used than earlier. A problem, however, is still to get a very stable film-base. 
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