HR: 1340h
AN: IN43B-0338    [Abstracts]
TI: Variable Quality Compression of Fluid Dynamical Data Sets Using a 3D DCT Technique
AU: * Loddoch, A
EM: loddoch@earth.uni-muenster.de
AF: Institute for Geophysics, University of Muenster, Germany, Corrensstr. 24, Muenster, 48151
AU: Schmalzl, J
EM: joergs@earth.uni-muenster.de
AF: Institute for Geophysics, University of Muenster, Germany, Corrensstr. 24, Muenster, 48151
AB: In this work we present a data compression scheme that is especially suited for the compression of data sets resulting from computational fluid dynamics (CFD). By adopting the concept of the JPEG compression standard and extending the approach of Schmalzl (Schmalzl, J. Using standard image compression algorithms to store data from computational fluid dynamics. Computers and Geosciences, 29, 10211031, 2003) we employ a three-dimensional discrete cosine transform of the data. The resulting frequency components are rearranged, quantized and finally stored using Huffman-encoding and standard variable length integer codes. The compression ratio and also the introduced loss of accuracy can be adjusted by means of two compression parameters to give the desired compression profile. Using the proposed technique compression ratios of more than 60:1 are possible with an mean error of the compressed data of less than 0.1%.
DE: 0525 Data management
DE: 3200 MATHEMATICAL GEOPHYSICS (0500, 4400, 7833)
DE: 3252 Spatial analysis (0500)
SC: Earth and Space Science Informatics [IN]
MN: Fall Meeting 2005