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GLOBE Claritas has modules for reading SEG-Y, SEG-B, SEG-D, SEG-2 and SEG-1 input, and for SEG-Y output. SEG-D Revision 1 and 2 input formats are supported. The READSEGY module has a range of features allowing it to read many SEG-Y variants, including options for byte-swapping, 2- and 4-byte integer and 3- and 4-byte real data samples, missing headers etc. You can also override the default byte assignments for any header word as the tape/discfile is read in. The internal Claritas data format is a modified form of SEG-Y. The data is stored as IEEE floating-point values in the native byte-ordering, plus some additions to the reel and trace headers. The Claritas extended SEG-Y files also have associated index files which contain maps of the primary and secondary keys in the file - this allows for efficient random access to any part of the file, and fast on-the-fly sorting without creating intermediate sort files. Files larger than 2Gb are supported by Claritas under
Compaq/Tru64, DEC-OSF, Next: Velocity>>
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