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Figure 1. Overview of aerial photogrammetric photography from 1956 to 1990
3. AERIAL PHOTOGRAMMTERIC PHOTOGRAPHY
IN THE REPUBLIC OF CROATIA SINCE 1990
Concerning the war occurrences in Croatia between 1990
and 1996 a discontinuity in the taking of aerial photographs
occurred. The reason was that Croatia had not had its own
service for taking of aerial photos before. However, in that
period studies of justification of aerial photography founding
were worked out what gave conclusion that for Croatia it is
necessary to have at least one service for aerial photography.
After gaining independence in 1993 the company Geofoto
from Zagreb enlarged its geodetic works also on
photogrammetric tasks. It carried out the first aerial
photogrammetric flights already in the spring 1994. Soon
after that the second geodetic company Geodetic Institute in
Osijek enlarged its activities on aerial photography, so that
there are two services for aerial photography in Croatia at the
moment. For photoflights the planes Turbo Piper Aztec and
Piper Navajo with integrated aerial photogrammetric cameras
Wild-Leica RC20/30 and ZEISS RMK TOP 15 are used.
Cyclical photogrammetric survey started in 1996 specifically
with photoflights of the west part of Istria from Umag to Pula
(figure 2). After analysis of state needs, in 1997 it was
concluded that it would be continued with taking of photos
according to the priorities at that time. In May 1997 the
north-west part of Croatia was taken and at the same time
aerial photos of the south-west part of Croatia started (figure
2). Since that year weather conditions were suitable, aerial
150
photos of Lika and towns Zadar, Sibenik and Split started too
(figure 2). In 1999 and 2000 the whole middle and south part
of Croatia were taken, so that the whole territory of the
Republic of Croatia was covered with cyclical aerial
photogrammetric survey. It was the first cycle of aerial
photos called “null-cyclical survey”.
Accepting the Book of Ordinances of Topographic Survey
and State Map Production Manner published in the Official
Gazette N.N. No. 55/2001 (further in this text “the Book of
Ordinances”) real planned and aimed process of cyclical
aerial photogrammetric survey started. In the article 8 of the
Book of Ordinances it is given that cyclical aerial
photogrammetric survey is made from the air at the scale not
smaller than 1:20000 in the periods of 5 years.
“Null-cyclical survey” showed, what is later also included
into the Book of Ordinances, that for the Republic of Croatia
the best solution for the cyclical survey is the scale 1:20 000.
Selection of region for the “null-cyclical survey” was
conditioned by the war processes, which means that regions
not occupied by the war were chosen. It was quite impossible
to form symmetrical and harmonious blocks.
The second cycle of aerial photos was planned according to
the Book of Ordinances so that each year about 20% of terri-
tory of the Republic of Croatia is taken in order to get aerial
photos as a main source for maps production
