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Scalar to be applied to SP number in bytes 197-200 to give the real value. Note that it is assumed that the shotpoint number refers to the source location nearest to the ensemble (CDP) location for a particular trace.
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This is probably only applicable to 2-D poststack data. This will typically be the same value as the ensemble (CDP) number in Trace Header bytes 21-24, but this does not have to be the case.” “For 3-D poststack data, cross-line number. If one in-line per SEG-Y file is being recorded, this value should be the same for all traces.” Y-coordinate of ensemble (CDP) position of this trace (scalar in Trace Header bytes 71-72 applies). X-coordinate of ensemble (CDP) position of this trace (scalar in Trace Header bytes 71-72 applies). (float) reciprocal of scaling factor to normalize range (float) negative of power used for dynamic range compression (float) first sample location for non-seismic data (float) sample spacing for non-seismic data SEG-Y Revison 0: Unassigned – for optional information. “Overtravel associated with taper at beginning or end of line: I=down (or behind), 2=up (or ahead).” Gap size (total number of groups dropped). Geophone group number of last trace within original field record. Geophone group number of trace number one within original field record. Geophone group number of roll switch position one. “Trace weighting factor – defined as 2 raised to the power (-N) volts for the least significant bit. “Time basis code: I=local, 2=GMT, 3=other, 4=UTC (Coordinated Universal Time).” “Taper type: 1=linear, 2=cosine squared, 3=other.”ĭay of year (Julian day for GMT and UTC time basis). “Sweep type: 1=linear, 2=parabolic, 3=exponential, 4=other.”
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“Gain type of field instruments: 1=fixed, 2=binary, 3=floating point, 4-N = optional use.” (For deep water work if data recording does not start at zero time.) Time between initiation time of energy source and time when recording of data samples begins. May be positive or negative.ĭelay recording time (ms). Time between time break and the initiation time of the energy source. Time between end of 240-byte trace ID header and time break.Positive if time break occurs after end of header, negative if time break occurs before end of header.” “Coordinate units: 1=length (m or ft), 2=seconds of arc, 3=decimal degrees, 4=degrees, minutes, seconds (DMS).” “Scalar to be applied to all coordinates in bytes 73-88 to give real value. “Scalar to be applied to all elevations and depths in bytes 41-68 to give real value. Source depth below surface (a positive number). “Receiver group elevation elevations above sea level are positive, below sea level are negative.” (1 is one trace, 2 is two stacked traces, etc.)“ĭistance from source point center to receiver group center (negative if opposite to direction in which line is shot). “Number of horizontally stacked traces yielding this trace. (1 is one trace, 2 is two summed traces, etc.)“ “Number of vertically summed traces yielding this trace. Trace number within the CDP ensemble – each ensemble starts with trace number one. Trace number within the original field record.Įnergy source point number – used when more than one record occurs at the same effective surface location. Trace sequence number within reel – each reel starts at trace number one. Ryan on HTTP Basic Authentication with ASP.Trace sequence number within line – numbers continue to increase if additional reels are required on same line.
#Identify zero byte file unix android
#Identify zero byte file unix how to
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#Identify zero byte file unix pro
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