Computer Science – Performance
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ttt..work...36p&link_type=abstract
Through Time; A Workshop On Titan's Past, Present and Future, NASA Goddard Space Flight Center, April 6th - 8th, 2010. Edited b
Computer Science
Performance
Scientific paper
Since Cassini's arrival at Saturn, VIMS has recorded over 104 cubes, containing over 10^7 spectra. This still increasing amount of observations precludes direct inspection of all data, either to select the observations, or to identify the occurrence and time variation of specific spectral or spatial features. Additionally, many VIMS observations are taken as a large number of cubes with small spatial extent, which cannot be meaningfully visualized without assembling mosaics. This work presents titan_browse, a tool developed to deal with these difficulties. Titan_browse comprises both a database of observations, and a visualization tool to inspect them. The database contains every VIMS observation of Titan in the PDS archive, and provides a flexible query system, which can select individual cubes or spatial pixels based on arbitrary functions of the instrumental or photometric data. Once observations are selected, titan_browse can be used to directly inspect them, through mosaics in several map projections, or displaying images of selected bands, or spectra of selected spatial pixels. This allows users to interactively explore the data, to refine queries to obtain those most useful to the intended analysis. The selected cubes or spectra can them be directly exported from the database, either to an IDL session, or to files (one format being the original cubes, in ISIS format). The cubes used in the database were processed to contain more geometric information than either the original PDS files or those that are produced by the VIMS pipeline, including the coordinates of the edges of each spatial pixel (necessary for precise mosaics), and more information on the illumination angles (to aid in analyses of specular reflections). This version of the titan_browse is a complete reimplementation of its previous titan_browse, to overcome the previous coverage and performance limitations, and is the first to be made publicly available.
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