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Title
Remote sensing for resources development and environmental management
Author
Damen, M. C. J.

390
It
—ITAttaA
it toiim
S.R. SLOVENIJA
C.A. SRS
PREGLEDNA KARTA
KLIMATSKIH CON
po 11. aprilu
po 16. aprilu
vz po 21.aprilu
t¿1/sA po l.maju
□ po 11.maju
AVSTRIJA
Figure 5. Regional division of Slovenia according to starting dates in dependancy of climatic conditions.
between 1 : 15 600 and 1 : 19 150.
For intensive plane areas the aerial survey is re
alised in the scale 1 : 10 000 and is used for revi
sion of topographic maps in scales 1 : 2880 and 1 :
2000. Camera is Zeiss with c - 305 mm with image mo
tion compensation which contributes to greater reso
lution and accuracy.
The main cycle is 3 years covering each year appro
ximately one third of the entire teritory. Permanent
aerial survey enables high qualitiy of final product
and greater flexibility for user needs. Cycle of 3
years is usefull at the following works:
- cyclic revision of topographic maps and plans
- maintenance of spatial data bank
- elaboration of planning documentation
- elaboration of urban and rural plans
- photointerpretation of forestry components
- elaboration of photo mosaics and photomaps.
The time for the realisation of aerial survey runs
from april to august. The starting point is defined
by the spring vegetation step, climaticaly given by
10°C of average daily temperature. Since the Slove
nian territory is not climaticaly homogenous it is
not possible to unify the starting point. The aerial
survey is there fore different for different geograp
hical locations and starts 2 to 3 weeks after vegeta
tion starting point. This enables the optimal time
period for agricultural vegetation.
For the metric restitution of the photographs addi
tional signalisation of geodetic points is realised
which gives greater accuracy of elaborated plans and
maps.
The cyclic aerial survey is financed by 81 users.
The quality and additional proposals for survey is
realised through users board having a meettings once
a year. The cyclic aerial survey is economicaly spe
aking for about 20 % less expensive then aerial sur
vey upon order. This is the result of systematic ap
proach and the continuity of the realisation.
Practical experiences
The present system of cyclic aerial survey started
to be operational from 1975. The film Agfa Gevaert
Pan 200 has been used in order to increase the re
solution between different kinds of vegetation (in
near infra red). Combination with narow angle and
image motion compensation gives the photographs of
good qualitiy, being extremly usefull in forestry
and agriculture. It is evident that better results
would be reached by IR films, which is at the moment-
not realiasable due to financial and technical pro
blems (the present techniques do not allow mass pro
duction of coloured contact copies and enlargements).
The advantage of cyclic aerial survey is at perma
nent availability of photographs which is not the ca
se at the aerial survey by order. The main disadvan
tage of the cyclic aerial survey is its unability to
meet the user special requirements in full extent.