P. Lindstrom, D. Koller, W. Ribarsky, L. Hodges, and N. Faust. An integrated global gis and visual simulation system. Report GIT-GVU-97-07, 1997.  Home/Search   Document Details and Download   Summary   Related Articles   Check

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P. Lindstrom, D. Koller, W. Ribarsky, L. Hodges, and N. Faust. An integrated global gis and visual simulation system. Report GIT-GVU-97-07, 1997.

....then discarded after the triangle strip has been constructed. For applications that demand interactive visualization and the highest possible frame rates, it is common to parallelize the otherwise sequential, interleaved tasks of refinement and rendering as two asynchronous processes or threads [14,23]. In this model, the render thread is periodically and asynchronously supplied with a list of geometry to render by the refinement thread. This display list is then used, and potentially reused over several frames, until a newly refined mesh is obtained. Our terrain visualization system allows ....

....that no cracks between them are created. Another constraint in our current system is that the input data be a single grid sampled at a uniform resolution. In many applications, multiple, possibly nested data sets at varying resolution need to be georeferenced and integrated into a single data set [23, 24]. Using our current approach, we would need to resample all data sets to a common highest resolution, which is impractical. Instead, we suggest partitioning the terrain both spatially and in resolution using a meta hierarchy of blocks, such as a quadtree, to organize the data. Our algorithms would ....

Peter Lindstrom, David Koller, William Ribarsky, Larry F. Hodges, Augusto Op den Bosch, and Nick Faust, "An integrated global gis and visual simulation system," Tech. Rep. GIT-GVU-97-07, Georgia Institute of Technology, Mar. 1997.

....graphics course participated in the study. Each participant performed a two part navigation task for each of the four interfaces. The interfaces were presented in every possible order to balance any order effects, such as learning or fatigue. VGIS, a whole Earth 3D terrain visualization system[5] was used to provide the 3D environment for the study. In the exocentric part, participants were asked to zoom in on white target cubes that appeared at various locations in North America. As the participants drew closer, the target became smaller and smaller, until a symbol was revealed. ....

P. Lindstrom, D. Koller, W. Ribarsky, L. Hodges, and N. Faust. An Integrated Global GIS and Visual Simulation System. Technical Report GIT-GVU-97-07, 1997.

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P. Lindstrom, D. Koller, W. Ribarsky, L. Hodges, N. Faust. "An Integrated Global GIS and Visual Simulation System." Report GIT-GVU-9707 (1997).

....Table 1: A Sample of Recognized Speech Commands interface and sent packets with the results over a network to the laptop. A Windows NT system ran a speech recognition interface and also sent the results over a network to the laptop. A diagram of the system is in Figure 3. 3.2. 1 VGIS VGIS[11] is a 3D global geospatial visualization system that displays phototextures of the Earth s surface overlaid on 3D elevation data. Three dimensional models of buildings are also included for some urban areas. Recently, we have also included real time 3D weather visualization in the VGIS framework. ....

P. Lindstrom, D. Koller, W. Ribarsky, L. Hodges, and N. Faust. An Integrated Global GIS and Visual Simulation System. Report GIT-GVU-97-07, 1997.

....then evaluate interface characteristics such as ease of learning and use, gesture recognizability, system responsiveness, and navigation task performance. A. The VGIS Project We have chosen the VGIS system for the multimodal interface because it provides a broad set of 3D navigational tasks. VGIS[14] is a whole earth 3D terrain visualization that allows navigation through several magnitudes of scale. A user can travel from an orbital perspective of the entire globe, to a first person view of 3D building models and sub meter resolution images of the earth s surface. Navigation and paging of ....

P. Lindstrom, D. Koller, W. Ribarsky, L. Hodges, N. Faust. "An Integrated Global GIS and Visual Simulation System." Report GIT-GVU-97-07 (1997).

....then discarded after the triangle strip has been constructed. For applications that demand interactive visualization and the highest possible frame rates, it is common to parallelize the otherwise sequential, interleaved tasks of refinement and rendering as two asynchronous processes or threads [16, 22]. In this model, the render thread is periodically and asynchronously supplied with a list of geometry to render by the refinement thread. This display list is then used, and potentially reused over several frames, until a newly refined mesh is obtained. Our terrain visualization system allows ....

P. Lindstrom, D. Koller, W. Ribarsky, L. F. Hodges, A. O. den Bosch, and N. Faust. An Integrated Global GIS and Visual Simulation System. Tech. Rep. GIT--GVU--97--07, Georgia Institute of Technology, Mar. 1997.

....more in each collection, that may be distributed at many spots throughout the world. Efficient out of core visualization methods permit timely paging of building data in support of real time navigation. Our approach uses an efficient quadtree hierarchical structure appropriate for global terrain [2] at the top level followed by methods appropriate for 3D object detail management at lower levels. The quadtree level at which the change over occurs from the quadtree hierarchy to the 3D object management structure will depend on the nature of the objects. The levels will be different, for ....

....such data [10] and because applications requiring accurate display of urban data (such as emergency response, urban planning, or urban warfare) are growing in importance. III. Placing 3D Objects in a Geospatial Hierarchy The forest of quadtrees has proven capability for handling global terrain [1, 2]. When considering buildings or other geospatial collections of objects, we would like to build on this structure, at least at the top level. If we have several cities in our global dataset, we want to quickly determine that the viewer is navigating towards, say, Los Angeles and does not need ....

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Peter Lindstrom, David Koller, William Ribarsky, Larry Hodges, and Nick Faust (1997). An Integrated Global GIS and Visual Simulation System. Report GIT-GVU-97-07.

....flythroughs of datasets ranging to 20 GB in size; even larger datasets are possible. We find that this combination of out of core visualization, which tends to focus on 3D data [1 3] and visual simulation, which places an emphasis on visual perception and real time display of multiresolution data [4,5], results in interactive terrain visualization with significantly improved data access and quality of presentation. This set of very large dataset visualization methods will also be of prime importance for visual simulation systems that handle not only terrains but large scale collections of ....

....on adapting application controlled segmentation for optimal rendering. This is one of the issues we address in this paper. III. Applying Intent and Perception to Optimize Paging For accuracy and speed, our terrain visualization system subdivides the globe into 32 quadrants, each 45 o x 45 o [5]. Each quadrant has its own quadtree; all are linked so that terrain crossing quadrant boundaries can be rendered correctly. To improve performance, the system is divided into multiple threads that can run in parallel. In particular, there is an independent rendering thread, which has a triple ....

Peter Lindstrom, David Koller, William Ribarsky, Larry Hodges, and Nick Faust (1997). An Integrated Global GIS and Visual Simulation System. Report GIT-GVU-97-07, submitted to Transactions on Visualization and Computer Graphics.

....sockets. For display on the Perceptive Workbench, we use the Simple Virtual Environment Toolkit (SVE) a graphics and sound library developed by the Georgia Tech Virtual Environments Group [9] In addition, we use the workbench version of VGIS, a global terrain visualization and navigation system [13, 14] as an application for interaction using hand and arm gestures. 4. Object Recognition and Tracking As a basic building block for our interaction framework, we want to enable the user to manipulate the virtual environment by placing objects on the desk surface. The system should recognize these ....

Lindstrom, P., D. Koller, W. Ribarsky, L. Hodges, and N. Faust. An Integrated Global GIS and Visual Simulation System. Georgia TR GVU-97-07 (1997).

....Environment Toolkit (SVE) a graphics and sound library developed by the Georgia Tech Virtual Environments Group. 8] SVE permits us to rapidly prototype applications used in this work. In addition we use the workbench version of VGIS, a global terrain visualization and navigation system [12, 13] as an application for interaction using hand and arm gestures. The workbench version of VGIS has stereoscopic rendering and an intuitive interface for navigation [29, 30] Both systems are built on OpenGL and have both SGI and PC implementations. 4. Object Recognition and Tracking As a ....

Lindstrom, Peter, David Koller, William Ribarsky, Larry Hodges, and Nick Faust. An Integrated Global GIS and Visual Simulation System. Georgia Tech Report GVU-97-07 (1997).

....actions, annotations, and decisions. All place and time updates throughout the CPOF system will be organized to meet time budgets, ensuring interactivity. The visualization system will be built on the successful and widely used VGIS system, which two of the co PIs developed in conjunction with ARL. [24, 25]. 2 The very efficient hierarchical structure, fast paging, and scalable data organization [9] will be extended to handle all spatially organized data within the CPOF system. The data structures will be enhanced to handle data of any size and fast data insertion techniques will be built to ....

Peter Lindstrom, David Koller, William Ribarsky, Larry Hodges, and Nick Faust. An integrated global GIS and visual simulation system. Transactions on Visualization and Graphics, 1998. submitted for review.

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Peter Lindstrom, David Koller, William Ribarsky, Larry Hodges, and Nickolas Faust. An integrated global gis and visual simulation system. 1997. submitted to Transactions on Visualization and Computer Graphics.

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