mirror of
https://github.com/wassname/segpy.git
synced 2026-06-27 20:22:56 +08:00
Robert Smallshire
75 lines
3.1 KiB
Python
75 lines
3.1 KiB
Python
"""
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SEG Y Header Definition
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"""
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from revisions import SEGY_REVISION_0, SEGY_REVISION_1
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HEADER_DEF = {"Job": {"pos": 3200, "type": "int32", "def": 0}}
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HEADER_DEF["Line"] = {"pos": 3204, "type": "int32", "def": 0}
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HEADER_DEF["Reel"] = {"pos": 3208, "type": "int32", "def": 0}
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HEADER_DEF["DataTracePerEnsemble"] = {"pos": 3212, "type": "int16", "def": 0}
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HEADER_DEF["AuxiliaryTracePerEnsemble"] = {"pos": 3214, "type": "int16", "def": 0}
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HEADER_DEF["dt"] = {"pos": 3216, "type": "uint16", "def": 1000}
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HEADER_DEF["dtOrig"] = {"pos": 3218, "type": "uint16", "def": 1000}
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HEADER_DEF["ns"] = {"pos": 3220, "type": "uint16", "def": 0}
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HEADER_DEF["nsOrig"] = {"pos": 3222, "type": "uint16", "def": 0}
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HEADER_DEF["DataSampleFormat"] = {"pos": 3224, "type": "int16", "def": 5}
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HEADER_DEF["DataSampleFormat"]["descr"] = {SEGY_REVISION_0: {
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1: "IBM Float",
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2: "32 bit Integer",
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3: "16 bit Integer",
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8: "8 bit Integer"}}
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HEADER_DEF["DataSampleFormat"]["descr"][SEGY_REVISION_1] = {
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1: "IBM Float",
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2: "32 bit Integer",
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3: "16 bit Integer",
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5: "IEEE",
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8: "8 bit Integer"}
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HEADER_DEF["DataSampleFormat"]["bps"] = {SEGY_REVISION_0: {
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1: 4,
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2: 4,
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3: 2,
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8: 1}}
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HEADER_DEF["DataSampleFormat"]["bps"][SEGY_REVISION_1] = {
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1: 4,
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2: 4,
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3: 2,
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5: 4,
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8: 1}
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HEADER_DEF["DataSampleFormat"]["datatype"] = {SEGY_REVISION_0: {
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1: 'ibm',
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2: 'l',
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3: 'h',
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8: 'B'}}
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HEADER_DEF["DataSampleFormat"]["datatype"][SEGY_REVISION_1] = {
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1: 'ibm',
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2: 'l',
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3: 'h',
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5: 'f',
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8: 'B'}
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HEADER_DEF["EnsembleFold"] = {"pos": 3226, "type": "int16", "def": 0}
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HEADER_DEF["TraceSorting"] = {"pos": 3228, "type": "int16", "def": 0}
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HEADER_DEF["VerticalSumCode"] = {"pos": 3230, "type": "int16", "def": 0}
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HEADER_DEF["SweepFrequencyEnd"] = {"pos": 3234, "type": "int16", "def": 0}
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HEADER_DEF["SweepLength"] = {"pos": 3236, "type": "int16", "def": 0}
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HEADER_DEF["SweepType"] = {"pos": 3238, "type": "int16", "def": 0}
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HEADER_DEF["SweepChannel"] = {"pos": 3240, "type": "int16", "def": 0}
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HEADER_DEF["SweepTaperLengthStart"] = {"pos": 3242, "type": "int16", "def": 0}
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HEADER_DEF["SweepTaperLengthEnd"] = {"pos": 3244, "type": "int16", "def": 0}
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HEADER_DEF["TaperType"] = {"pos": 3246, "type": "int16", "def": 0}
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HEADER_DEF["CorrelatedDataTraces"] = {"pos": 3248, "type": "int16", "def": 0}
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HEADER_DEF["BinaryGain"] = {"pos": 3250, "type": "int16", "def": 0}
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HEADER_DEF["AmplitudeRecoveryMethod"] = {"pos": 3252, "type": "int16", "def": 0}
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HEADER_DEF["MeasurementSystem"] = {"pos": 3254, "type": "int16", "def": 0}
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HEADER_DEF["ImpulseSignalPolarity"] = {"pos": 3256, "type": "int16", "def": 0}
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HEADER_DEF["VibratoryPolarityCode"] = {"pos": 3258, "type": "int16", "def": 0}
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HEADER_DEF["Unassigned1"] = {"pos": 3260, "type": "int16", "n": 120, "def": 0}
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HEADER_DEF["SegyFormatRevisionNumber"] = {
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"pos": 3500, "type": "uint16", "def": 100}
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HEADER_DEF["FixedLengthTraceFlag"] = {"pos": 3502, "type": "uint16", "def": 0}
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HEADER_DEF["NumberOfExtTextualHeaders"] = {"pos": 3504, "type": "uint16", "def": 0}
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HEADER_DEF["Unassigned2"] = {"pos": 3506, "type": "int16", "n": 47, "def": 0}
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