mirror of
https://github.com/wassname/segpy.git
synced 2026-07-02 03:00:12 +08:00
Robert Smallshire
75 lines
3.0 KiB
Python
75 lines
3.0 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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SH_def = {"Job": {"pos": 3200, "type": "int32", "def": 0}}
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SH_def["Line"]= {"pos": 3204, "type": "int32", "def": 0}
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SH_def["Reel"]= {"pos": 3208, "type": "int32", "def": 0}
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SH_def["DataTracePerEnsemble"]= {"pos": 3212, "type": "int16", "def": 0}
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SH_def["AuxiliaryTracePerEnsemble"] = {"pos": 3214, "type": "int16", "def": 0}
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SH_def["dt"]= {"pos": 3216, "type": "uint16", "def": 1000}
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SH_def["dtOrig"]= {"pos": 3218, "type": "uint16", "def": 1000}
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SH_def["ns"] = {"pos": 3220, "type": "uint16", "def": 0}
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SH_def["nsOrig"] = {"pos": 3222, "type": "uint16", "def": 0}
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SH_def["DataSampleFormat"] = {"pos": 3224, "type": "int16", "def": 5}
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SH_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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SH_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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SH_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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SH_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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SH_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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SH_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: 'float',
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5: 'f',
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8: 'B'}
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SH_def["EnsembleFold"] = {"pos": 3226, "type": "int16", "def": 0}
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SH_def["TraceSorting"] = {"pos": 3228, "type": "int16", "def": 0}
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SH_def["VerticalSumCode"] = {"pos": 3230, "type": "int16", "def": 0}
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SH_def["SweepFrequencyEnd"] = {"pos": 3234, "type": "int16", "def": 0}
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SH_def["SweepLength"] = {"pos": 3236, "type": "int16", "def": 0}
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SH_def["SweepType"] = {"pos": 3238, "type": "int16", "def": 0}
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SH_def["SweepChannel"] = {"pos": 3240, "type": "int16", "def": 0}
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SH_def["SweepTaperLengthStart"] = {"pos": 3242, "type": "int16", "def": 0}
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SH_def["SweepTaperLengthEnd"] = {"pos": 3244, "type": "int16", "def": 0}
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SH_def["TaperType"] = {"pos": 3246, "type": "int16", "def": 0}
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SH_def["CorrelatedDataTraces"] = {"pos": 3248, "type": "int16", "def": 0}
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SH_def["BinaryGain"] = {"pos": 3250, "type": "int16", "def": 0}
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SH_def["AmplitudeRecoveryMethod"] = {"pos": 3252, "type": "int16", "def": 0}
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SH_def["MeasurementSystem"] = {"pos": 3254, "type": "int16", "def": 0}
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SH_def["ImpulseSignalPolarity"] = {"pos": 3256, "type": "int16", "def": 0}
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SH_def["VibratoryPolarityCode"] = {"pos": 3258, "type": "int16", "def": 0}
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SH_def["Unassigned1"] = {"pos": 3260, "type": "int16", "n": 120, "def": 0}
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SH_def["SegyFormatRevisionNumber"] = {"pos": 3500, "type": "uint16", "def": 100}
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SH_def["FixedLengthTraceFlag"] = {"pos": 3502, "type": "uint16", "def": 0}
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SH_def["NumberOfExtTextualHeaders"] = {"pos": 3504, "type": "uint16", "def": 0}
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SH_def["Unassigned2"] = {"pos": 3506, "type": "int16", "n": 47, "def": 0}
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