JuxtaView

Naveen Krishnaprasad, Shalini Venkataraman, Luc Renambot, Jason Leigh

JuxtaView is a tool designed specifically for scalable tiled displays to visualize extremely high-resolution images. Scientists are finding an increasing need to display visualizations on extremely high-resolution displays, such as EVL’s 6000x3000-pixel LCD tiled display, called the PerspecTile, driven by a cluster of PCs. JuxtaView employs the MPI communication library to distribute Open GL commands for synchronization of display on all tiles. Furthermore, work is underway to utilize LambdaRAM, a remote data access tool built over the QUANTA networking API. LambdaRAM enables an application to efficiently utilize a collective compute cluster memory to store extraordinarily large data and minimize latency effects by pre-fetching parts of the data before its is likely to be needed. The goal, in JuxtaView, is to provide a means to rapidly pan and zoom through images of arbitrary resolutions.

EVL has been developing this technology to support two domain research areas: Geosciences, in partnership with the Scripps Institution of Oceanography, and Bioscience with the Biomedical Informatics Network Research (BIRN) effort headed by the National Center for Microscopy and Imaging Research at the University of California, San Diego. EVL is also applying this technology to the visualization of aerial photography images provided by the US Geological Survey as part of a homeland defense initiative. In this application, aerial photographs of 133 urban areas are being photographed at a 3-foot resolution. This amounts to a total of approximately 38 Terabytes of image data that JuxtaView must be able to navigate through. Pictured here is EVL's Perspectile showing a stereo image of the Grand Canyon. This image from USGS provides a topographical map of the canyon, generated from satellite bathymetry data.