New versions of SEG-D SEG Annual Meeting – New Orleans Tuesday Oct 20, 2015 Rune Hagelund, DAECO.

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New versions of SEG-D SEG Annual Meeting – New Orleans Tuesday Oct 20, 2015 Rune Hagelund, DAECO

SEG-D Rev 3.0 September 2014 Final version of 3.0 Final version of 3.0 Further development will be 3.1 Further development will be 3.1 Sent to publication, but not yet put onto Sent to publication, but not yet put onto More details presented at 2014 annual meeting More details presented at 2014 annual meeting Please refer to release letter for full details Please refer to release letter for full details

SEG-D Rev 3.1 Oct 2015 Final draft version of SEG-D 3.1 Final draft version of SEG-D 3.1 Will be published soon Will be published soon New functionality: Little endian samples and new CRS definition format New functionality: Little endian samples and new CRS definition format Not binary compatible with Rev 3.0 Not binary compatible with Rev 3.0 –Most headers are identical NOTE: Only samples can be little-endian, all headers are still big-endian NOTE: Only samples can be little-endian, all headers are still big-endian

SEG-D Rev Changes Little endian samples Little endian samples – – Little endian 24 bit 2's complement integer – – Little endian 32 bit 2's complement integer – – Little endian 32 bit IEEE – – Little endian 64 bit IEEE Other formats not supported as they do not match internal computer data formats Other formats not supported as they do not match internal computer data formats –Would cause additional implementation and test cost for no benefit

SEG-D Rev Changes Added support for new P1/11 Coordinate Reference System definition format –OGP CRS format v1.1 (April 2015) – –Old 3.0 CRS format deprecated but still supported Shared CRS format with all OGP P-formats (and the coming updated SPS and SEG-Y)

SEG-D Rev Changes June 2015 leap second added June 2015 leap second added Add producers OCTIO (58) and inApril (59) Add producers OCTIO (58) and inApril (59) Various clarifications and typo fixes Various clarifications and typo fixes For details please refer to release letter For details please refer to release letter