Work
rianeulation ..... ronem vitet an 80 points
TTellurometer measuring ............... Ne nnn 42 —
Trigonometric height-measuring ................ 130 ,
Barometric height-measuring ................ hs 120 -,
Sienalization ....... aam annis nes s to 100 ,
Result
Triangulation
standard error |... 5. ves . +45"
5 a s een Miei RR trade estie a alere ta ah cue an 25:012. m
Tellurometer
polvsonlensth ...... rr rrr mn sei closure error
11) Kilometers iu... i edn canine 1.07 m
69 a EE N ne 0.36 ,,
66 p DOE NS. Mea q a dis cM 0.35.5
51 RP 0.20 ,,
31 > {one length) “ou... i, ..un, 0.14
Trigonometric height-measuring
standard error ii. i aR RE Le Ra + 025 m
Time
2 mon 22... inui redis mun an dai inm hk mes idi. 127 days
P M a rd quu E M (appr. 63 days per man)
met
appr. 500 Sw. Crowns per
triangulation point
Fig. 4. Geodetic work — Nordkalott Project 1958.
res) is fully satisfactory. Later, when a project takes on more
definite outlines, polygon chains are surveyed by terrestrial means.
Thi
s procedure saves unnecessary work on the ground.
The Nordkalott project which is as yet only in a preliminary stage,
has
shown that the following conditions govern efficient and rapid
execution of photogrammetric and geodetic work of the type concerned:
L
10
A basic geodetic net with few but precisely established stations
must be provided as early in the project as possible.
The small-scale planning should be based on aerial photographs
taken from high altitude (6.000 to 10.000 metres).
Model studies should be made by stereoscopy in combination with
the use of other data in order to "screen out” unrealistic proposals.
Low-altitude airphotographs of limited regions where detail study
1s required.
Avoidance of unnecessary ground survey work by acquisition of
photo control points.
Adaption of surveying methods to the degree of precision required.
Combination of methods to suit conditions from case to case. This
requirement can be met only by well-qualified personnel. A small
staff of carefully selected specialists is desirable.
