26-04-2010, 11:45 AM
1. Introduction
Data dealing with our spatial environment move more and more from 2D representations to actual 3D worlds. Maps, aerial photographs are more and more replaced by 3D models in which the relief and the characteristics of the elements (building, vegetation...) in the scene appear. This visualisation mode of information is more natural for a user because it better corresponds to its perception of a real environment. Many applications can benefit from this 3D modeling of the data: civil safety (intervention after natural disasters, flood or fire), military defence, etc. The stake consists on the one hand in knowing well the ground of intervention before going there, then on the other hand, once on the spot, in having access in real time to information on the evolution of the ground, in order to move and intervene in a safe and effective way. The 3D models then propose "faithful" representations of the reality. General public can also benefit from this three-dimensional new mode of representation to guide and locate themselves within urban environments. On demand web services for maps delivery (e.g. standard WMS - Web Map Service, (OGC, 2006)), or services such as Google Earth start to propose maps of cities to sedentary or mobile users, in which the buildings or the principal monuments appear in 3D. Even if the photo-realistic portrayal of these representations remains still largely perfectible, it becomes more intuitive to users to locate in such 3D environments. Delivery over Internet or dedicated to mobile users of such environments or more simply of photo-realistic objects in 3D is still in its infancy. Indeed, even if the technologies based on XML such as VRML, geoVRML or X3D (ISO, 2004) start to make possible the delivery of 3D scenes on diverse networks, it remains a long (research) work before achieving the real time delivery of complete interactive photo-realistic environments of virtual reality (Kalawsky, 2004) or augmented reality (AR) scenes. Such environments are composed of scenes where 2D or 3D objects, audio or textual information are added to the user vision of the real environment and with which this one can interact. These objects or information are generally provided, in real time, according to the location of the user, its "surrounding" and its context of use (personalisation, user preferences, etc.). This type of technique would greatly increase the immersive aspects and interactivity of the produced scenes and, would enrich the user perception of its spatial surrounding. For example, the firemen which intervene in a building on fire could, according to their location in the building, the position of the other operating teams, their mission affected by the headquarters, have their vision of the reality of the intervention scene augmented in real time. A map of the building with location of the other teams, a video showing what a particular team is facing, on demand detailed maps of a peculiar part of the building could thus be elements which would come to be added to their vision of the theatre of the operations.
Presented By:
Thierry Badard1
1Centre for Research in Geomatics,
Department of geomatic sciences, Laval University
read full report
http://geosoa.scg.ulaval.ca/en/index.php..._File_id=1
Data dealing with our spatial environment move more and more from 2D representations to actual 3D worlds. Maps, aerial photographs are more and more replaced by 3D models in which the relief and the characteristics of the elements (building, vegetation...) in the scene appear. This visualisation mode of information is more natural for a user because it better corresponds to its perception of a real environment. Many applications can benefit from this 3D modeling of the data: civil safety (intervention after natural disasters, flood or fire), military defence, etc. The stake consists on the one hand in knowing well the ground of intervention before going there, then on the other hand, once on the spot, in having access in real time to information on the evolution of the ground, in order to move and intervene in a safe and effective way. The 3D models then propose "faithful" representations of the reality. General public can also benefit from this three-dimensional new mode of representation to guide and locate themselves within urban environments. On demand web services for maps delivery (e.g. standard WMS - Web Map Service, (OGC, 2006)), or services such as Google Earth start to propose maps of cities to sedentary or mobile users, in which the buildings or the principal monuments appear in 3D. Even if the photo-realistic portrayal of these representations remains still largely perfectible, it becomes more intuitive to users to locate in such 3D environments. Delivery over Internet or dedicated to mobile users of such environments or more simply of photo-realistic objects in 3D is still in its infancy. Indeed, even if the technologies based on XML such as VRML, geoVRML or X3D (ISO, 2004) start to make possible the delivery of 3D scenes on diverse networks, it remains a long (research) work before achieving the real time delivery of complete interactive photo-realistic environments of virtual reality (Kalawsky, 2004) or augmented reality (AR) scenes. Such environments are composed of scenes where 2D or 3D objects, audio or textual information are added to the user vision of the real environment and with which this one can interact. These objects or information are generally provided, in real time, according to the location of the user, its "surrounding" and its context of use (personalisation, user preferences, etc.). This type of technique would greatly increase the immersive aspects and interactivity of the produced scenes and, would enrich the user perception of its spatial surrounding. For example, the firemen which intervene in a building on fire could, according to their location in the building, the position of the other operating teams, their mission affected by the headquarters, have their vision of the reality of the intervention scene augmented in real time. A map of the building with location of the other teams, a video showing what a particular team is facing, on demand detailed maps of a peculiar part of the building could thus be elements which would come to be added to their vision of the theatre of the operations.
Presented By:
Thierry Badard1
1Centre for Research in Geomatics,
Department of geomatic sciences, Laval University
read full report
http://geosoa.scg.ulaval.ca/en/index.php..._File_id=1