New versions of SEG-D SEG Annual Meeting – Denver Tuesday Oct 28, 2014 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

SEG-D Rev 3.0 September Changes New channel types (ChannelSet byte 4) New channel types (ChannelSet byte 4) – –0x9A Source excitation – –0x9B Source valve – –0x9C Source overload New physical units supported for samples (ChannelSet byte 62) New physical units supported for samples (ChannelSet byte 62) – –0x14 Millimeter – –0x15 Meter

SEG-D Rev 3.0 September Changes Updated measurements to support Energistics Unit of Measure v1.0 Updated measurements to support Energistics Unit of Measure v1.0 –Some units removed and added –Note: % removed, use EUC –Several new measurement types added to standards-committee/wiki/- /wiki/Main/SegMeasurements standards-committee/wiki/- /wiki/Main/SegMeasurementshttp:// standards-committee/wiki/- /wiki/Main/SegMeasurements

SEG-D Rev 3.0 September Changes New producers New producers – –Seismic Instruments, Inc (code 54) – –TGS (code 55) – –Hewlett Packard (code 56) – –Modern Seismic Technology, LLC (code 57)

SEG-D Rev 3.0 September Changes Some clarifications of usage Some clarifications of usage For more details please refer to release letter For more details please refer to release letter

SEG-D Rev 3.1 New version of SEG-D New version of SEG-D 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 – –Old stanza format deprecated but still supported Shared CRS format with all OGP P-formats (and the coming updated SPS and SEG-Y) OGP working on a format update so Appendix D1 will be changed accordingly prior to release OGP working on a format update so Appendix D1 will be changed accordingly prior to release

SEG-D Rev Questions Should more be added? Should more be added? Can we go ahead and publish this version? Can we go ahead and publish this version?