Proceedings, XXth congress: Proceedings, XXth congress

Altan, M. Orhan

Bibliographic data

Multivolume work

Persistent identifier:: 1663674213

Title:: Proceedings, XXth congress

Sub title:: Istanbul, 12 - 23 July 2004

Year of publication:: 2004

Place of publication:: Istanbul

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1663674213

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.; Auch bezeichnet als XXth International Congress for Photogrammetry and Remote Sensing

Editor:: Altan, M. Orhan

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing, Commission Primary Data Acquisition

Document type:: Multivolume work

Volume

Persistent identifier:: 166368779X

Title:: Proceedings, XXth congress

Scope:: IV, 226 Seiten

Year of publication:: 2004

Place of publication:: Istanbul

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 166368779X

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(35,B8)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.

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

Editor:: Altan, M. Orhan

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 20., 2004, Istanbul; International Society for Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: VIRTUAL ENVIRONMENTS IN PLANNING AFFAIRS Getting closer to geographic data, a better way! Mohammed Abdul Mannan, Bogdahn Juergen.

Document type:: Multivolume work

Structure type:: Chapter

ınbul 2004 | the area re inside - Node. for each ct so the ne object essary to > parts of on o an IFS- scene, all e created a surface the parcel nected to rd can be way you f the land ain, and it red in the ad. y example ided with how what ing walls navigates with their s in green 1g a table, e). le is used 's, the use esponding L Viewer s color. International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B-YF. Istanbul 2004 Figure 4. Thematic query based on USE from attribute table. (O Stadtmessungsamt Stuttgart) 3. VIRTUAL REALITY The second part of the project is focussed on Virtual Reality. Virtual Reality is an immersive experience in which participants wear tracked, head-mounted displays to visualize, and listen to 3-D sounds and are free to explore and interact within a 3-D world. This part of project is aimed to allow user to interact with the world and display the attributes as text, while the user is still navigating around in immersive environment like C.A.V.E or Responsive Workbench. VR is multi-modal that defines the more hardware oriented interface definition as the combination and cooperation of various input and output channels, which distinguishes the interface channels more from the point of media instead of the sensory perception. Dynamic behaviour introduces the notion of time into virtual environments. A highly interactive system has to deal with time in general and specifically with variable time frames and their synchronization. Responsive virtual environments should operate in real-time, that is, the response time and update rate of the system is high enough so that the boundary between user and virtual environment, the so-called interface, seems to vanish. This property is one of the major differences between VR systems and other 3D systems. 3.1 Tools Whether they're images, 3-D sounds, or tactile vibrations, all aspects of VR must be coordinated and precisely delivered otherwise confusion will result. The computer system and external hardware that supply effectors (HMD or C.A.V.E) with the necessary sensory information comprise the reality engine (Pimentel and Teixeira 1993). This project has been tested in the C.A.V.E at Fraunhofer Research Institite for Industrial Engineering IAO in Stuttgart using the application software "Lightning VR" developed by them. Its core component is a database called object pool. The interactivity and the behaviour can be introduced with functional objects, so-called scripts and communication channels, so-called routes. These communication channels define application specific event propagation and therefore the interactivity (Blach et al 1998). Tcl/Tk programming language is used for interaction with lightning, as it is easy to integrate into other systems (Ousterhout, 1993). 25 3.2 Input Data Input geometry data for this application is the same VRML model converted from the ASCIH file in the above web3D project. The model consists of buildings and terrain information of Stuttgart city. Each building has unique name defined to the node that is describing the geometry. Lightning VR uses LibVRML97 for reading and displaying VRML files, which is a portable C++ class library (Chris Morley, 2002). This library can access the properties like position, orientation, scale, centre of bounding box etc. of the world files in scene. The attribute information concerned to the objects, which was purposefully created and saved as text file called “connection table” in the first part of project. This connection table has the information like Definition name, x, y, z, House name etc. Here definition name will act as primary key in connecting spatial and non-spatial data. 3.3 Selection of building The input device can be a 3D mouse or glove etc, for the identification of objects in the virtual environment. The properties like position, orientation, scale etc, of input device is calculated by motion sensor in Lightning. In order to make input device a selecting tool, a ray has to be made active using ItSelectRay. It's a library under Lightning server, which is invisible. It can sense the objects hit and returns field values like first object hit, position & orientation, count of hit objects, etc, to the application. It is quite similar to pick() method of Cortona in Web3D project. The position and orientation values of ray were now routed (borrowed) from motion sensors properties, to make the input instrument act as a selecting tool. Now this ray (cursor) can be used to sense any object in virtual world. While moving the input device over building, it senses the object, recognizes it and sends the definition (name) to NodeHitOut property of SelectRay. This definition name will be used as primary key to match with the concerned attribute data that is stored in the text file. 3.4 Connection to attribute data The attribute data of the model is available as separate text file. The program written in Tcl will read the text file line by line and check if the definition name from the ray, matches with first field of the text file. Once matched, the whole line of the text file is converted to text element using ltText property of Lightning and displayed over the object, which you pointed in runtime scene situation, as shown in figure 5. Powered By sgi OpenGL Performer Figure 5. Selection and attribute display of the building (O Stadtmessungsamt Stuttgart)

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