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3. DTM, REMOTE SENSING AND GIS
The representative variety of basic and applied products
stands for the powerful facilities of the DTM Lake Fertó.
They all have recently been produced and analysed
(Csaplovics et al. 1996). Aerial CIR-photo-interpretation
of the Austrian and Hungarian reed belt add valuable
informations concerning lateral extension of reed areas
both in an actual and multitemporal sense (Csaplovics
1984, Csaplovics 1989, Márkus 1986).
The contour line maps of Lake Fertó integrate these
informations and thus give the opportunity to study the
relation between water-reed-borderlines and
sedimentation (uplanding) with the highest vertical
accuracy possible (contour line interval 10cm). Data of
the DTMs are available and ready for operational
application by the interdisciplinary user community.
Further activities will focus on the synthesis of reed
classification based on aerial CIR-photography and the
DTM. Besides having solved a selective problem of data
collection for calculating DTMs consisting of more than
10000 points located in inaccessible water and reed
areas of the lake, the DTM Lake Fertó represents a
powerful application of research on operationalization of
DTM-software for creating topographic as well as
multithematic information systems of regions of
outstanding ecological value. For the first time scientists
of Austria and Hungary cooperated in producing cross-
border contour line maps of the bottom of the lake and
its reed belt and in building up the core modul of the
Geographic Information System of the Austrian-
Hungarian Fertó Tó National Park. Based on these
postive experiences the DTM Fertô T6 will be the
platform for forthcoming projects like the cross-border
interpretation of the ecological structure of the reed belt
(180km?) by combined methods of aerial CIR- and high
resolution space photo-interpretation as well as by
correlated field work. Actual dynamics of sediment
deposition can only partly be discussed when comparing
the results of the recent program with nivellement
surveys of the lake made during a period of very low
water in the early sixties and with inaccurate
measurements by sounding dating back to the beginning
of the century. Therefore the homogenous digital terrain
models of Lake Fertô will be basic data pools for
evaluating comparative time series of topo-chronological
change detection concerning sediment layer thicknesses
and/or extension of dried out areas. Thus the basic
Modul of the Geographic Information System Fertô T6
will consist of a fully operational digital 4D-model
consisting of topo-chronological spatial and
multithematic informations.
4.ACKNOWLEDGEMENTS
Cooperation of the Institutes of Photogrammetry and
Remote Sensing of the University of Sopron and the
University of Technology Vienna has been funded by the
Hungarian Academy of Sciences and the Austrian
Ministry of Research and Science.
169
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