International cooperation and technology transfer

Fras, Mojca Kosmatin

Bibliographic data

Monograph

Persistent identifier:: 856490555

Author:: Fras, Mojca Kosmatin

Title:: International cooperation and technology transfer

Sub title:: Ljubljana, Slovenia, February 2 - 5, 2000 : proceedings of the workshop

Scope:: VI, 163 Seiten

Year of publication:: 2000

Place of publication:: London

Publisher of the original:: RICS Books

Identifier (digital):: 856490555

Illustration:: Illustrationen, Diagramme

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Monograph

Collection:: Earth sciences

Chapter

Title:: INTERACTIVE VISUALIZATION OF TERRAIN MODELS AND ORTHOPHOTOS. Lionel Dorffner, assistant professor

Document type:: Monograph

Structure type:: Chapter

50 INTERACTIVE VISUALIZATION OF TERRAIN MODELS AND ORTHOPHOTOS Lionel Dorffner, assistant professor e-mail: ld@ipf.tuwien.ac.at Institute of Photogrammetry and Remote Sensing, Vienna University of Technology Gusshausstr. 27-29, A-1040 Vienna, Austria tel: ++43-1 -58801 -12201; fax: ++43-1 -58801 -12299 Commission VI, Working Group 3 and Commission IV, Working Group 3 joint meeting KEY WORDS: interactive, DTM, visualization, virtual reality, animation, VRML, SCOP ABSTRACT Nowadays, generating data of high quality and high accuracy is not sufficient any more for convincing customers and sponsors. At least equally important is an appropriate and impressive way of data presentation. As a consequence, an additional module to SCOP has been developed and implemented. The new Animated Terrain Model (ATM) tool provides an easy way for preparing and exporting SCOP DTM (Digital Terrain Model) data and orthophoto mosaics for interactive 3D visualization with the help of VRML. As the VRML format was intended to be used for Internet applications, it has been designed to handle a reasonably small amount of data. Therefore, the ATM development concentrated on processing and interactive visualisation of extensive data sets as they are common in DTM and orthophoto applications. This article describes the possibilities and limitations of the VRLM format in that context with the help of spaceborne and airborne imagery. KURZFASSUNG Aufgrund der rasanten technologischen Entwicklung im Bereich der EDV reicht die Erzeugung von Daten hoher Qualität und Genauigkeit allein oftmals nicht mehr aus, um Kunden und Geldgeber zu befriedigen. Genauso wichtig ist es, diese in einer modernen, ansprechenden und beeindruckenden Weise präsentieren zu können. Dieser Entwicklung Folge tragend wurde das SCOP Modul ATM (Animiertes Geländemodell) entwickelt. Dieses ermöglicht auf einfache Weise die Aufbereitung von digitalen Geländehöhendaten (DHM) und Orthophotos für eine interaktive Visualisierung basierend auf dem Datenformat VRML. Nachdem VRML das Standardformat zur Beschreibung interaktiver virtueller 3D Welten im Internet ist, wird es primär für kleine Datenmengen eingesetzt. Bei der Entwicklung von ATM wurde daher besonderes Augenmerk darauf gelegt auch große Datenmengen, wie sie bei Verwendung von Geländemodellen und Orthophotos auftreten, interaktiv visualisieren zu können. Dieser Beitrag beschreibt Möglichkeiten und Grenzen von VRML für diesen Anwendungsbereich anhand eines realisierten Projektes. 1 INTRODUCTION Today digital terrain models (DTM) and orthophotos are both standard product of photogrammetric restitution. The quality of the terrain model - and furthermore of the orthophoto - depends on the technique used for primary data acquisition as well as on the software used for generating and storing the terrain data structure. For the acquisition we can distinguish between the following methods [Gruen A., 1998]: digitization of maps (simple way, sometimes necessary if no other sources are available - only usable, if old maps already exists) tachymetry (method of engineering surveying - only viable for small areas) aerial photographs (traditional method - best tested and proved to give good and accurate results) laser scanning (new and promising technique, especially for deriving surface models - very fast although not fully tested yet) other remote sensing techniques (best suited for very large areas, where high accuracy is not of main interest.) The most relevant forms of discrete terrain representation are: regular grid (simplest representation, often the result of automatically generated DTMs on Digital Photogrammetric Stations - contains no further structure information, only 2.5D, compact storage capability)

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