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HIGH RESOLUTION DIGITAL TERRAIN MODELS OF THE BOTTOM OF LAKE FERTÓ (AUSTRIA, HUNGARY) - A 
HUNGARIAN-AUSTRIAN JOINT PROJECT FOR CREATING CROSS-BORDER DATA BASES FOR ECOSYSTEMS 
RESEARCH 
Lászlo Bácsatyai, Institute of Photogrammetry and Remote Sensing, University of Sopron, Hungary 
Elmar Csaplovics, Institute of Photogrammetry and Remote Sensing, University of Dresden, Germany 
Istvan Márkus, Institute of Photogrammetry and Remote Sensing, University of Sopron, Hungary 
Adele Sindhuber, Institute of Photogrammetry and Remote Sensing, University of Technology, Vienna, Austria 
Commission VII, WG VII/5 
KEYWORDS: DTM, Mapping, Vegetation, Monitoring, Modeling, Ecosystems, Limnology 
ABSTRACT 
Digital terrain models (DTMs) of bottoms of lakes depend on selected methods of data collection and data treatment. 
As research on limnetic ecosystems needs exact informations of the topography of the regions under investigation 
DTMs are most efficient tools for providing suitable data bases for interdisciplinary cooperation. Applying DTMs to 
hydrological and limno-ecological tasks opens a wide range of possibilities of multithematic modelling and simulation 
of ecosystems behaviour in function of variations of water levels, water currents and patterns of human impact. 
Building up powerful data bases for holistic research has to connect DTM layers with multitemporal remotely sensed 
informations of landuse and landcover. Very high resolution mapping of vegetation structure, physiognomy and 
vitality is guaranteed by colour infrared (CIR) aerial photography and by space photography. Digital data of the 
topography of the terrain and of landcover extracted from DTM and multisensor images are therefore the basic parts 
of an operationalized GIS for monitoring and modelling of limnetic ecosystems. 
RÉSUMÉ 
Models numériques du terrain (MNT) sont de la haute importance pour créer des bases des informations spatiales sur 
les écosystémes des lacs. Le terrain d'interet étant pas accessible, les methodes d'évaluer les differences du niveau 
du fond de lac doivent étre spécial. La hydrologie et la limnologie sont besoin des informations numériques sur le 
terrain en haute résolution. Le traitement thématique des MNTs permets de modeler et simuler la condition des 
écosystémes en fonction des variations de niveau d'eau, des courants et des activités de l'homme. L'intégration de 
l'interprétation des photographies aériennes en couleur infrarouge (CIR) et des photographies spatiales en haute 
résolution donne des informations sur la structure, la taxinomie et la vitalité de la vegetation lacustre en fonction du 
niveau et de la structure du fond du lac. Un systéme d'information géographique sur les écosystémes des lacs doit 
donc etre fondée sur deux colonnes - l'une le MNT, l'autre la télédétection. 
KURZFASSUNG 
Digitale Gelándemodelle (DGMe) von Seebóden liefern wichtige Informationen im Rahmen von Forschungen zur 
Limno-Okologie. Die spezielle Aufgabe, in größtenteils unzugánglichen Gebieten Mefspunkte abzusetzen, erfordert 
spezielle Methoden der Datenerfassung und -verarbeitung. Forschungen zur Hydrologie und Ökologie der Seen können 
die digitale Datenbasis eines hochauflösenden Geländemodells vor allem zur Dokumentation, Modellierung und 
Simulation von Dynamismen der Sedimentation, von Sedimentmächtigkeiten, Wasserstandsschwankungen und 
resultierenden Analysen des Wasserhaushaltes nutzen. Die Verknüpfung der DGMe mit multitemporalen Kartierungen 
der Vegetationsstrukturen, -gemeinschaften und des Vitalitätszustandes einschließlich der Muster von Landnutzung 
auf Basis hoch auflósender Farb-Infrarot-Luftbilder (CIR) und Weltraumphotographien ermöglicht die komparative 
Analyse von Parametern der Vegetation (Schilf), der Wasserflächen und des Seeuntergrundes. 
1. INTRODUCTION resolution remotely sensed data. CIR-aerial photography, 
; space photography and satellite imagery of the earth 
High resolution digital terrain models (DTMs) are observation programs of Spot and Landsat are worthful 
Important modules of environmental information systems tools for landcover and landuse mapping. Integrating 
(Petrie et Kennie, 1990, Goodchild et al. 1993, digital imagery with digital terrain models is part of a 
Michener et al., 1994, Mather, 1995). DTMs of bottoms GIS-approach to strengthen efforts in research on the 
of lakes can support multithematic investigations ecology of lakes. 
especially in the fields of hydrology, limnology and Lake Fertó and the Hanság, a relic of a lowland moor 
vegetation sciences. Mapping submersed and littoral east of the lake, are part of the Austrian-Hungarian 
vegetation is optimized by the interpretation of high border region southeast from Vienna. The former 
167 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996