SoVRSegyFileHeader Struct Reference

VolumeViz SEGY file header. More...

#include <VolumeViz/readers/SoVRSegyReader.h>

List of all members.

Public Attributes

int jobid
int lino
int reno
short ntrpr
short nart
unsigned short hdt
unsigned short dto
unsigned short hns
unsigned short nso
short format
short fold
short tsort
short vscode
short hsfs
short hsfe
short hslen
short hstyp
short schn
short hstas
short hstae
short htatyp
short hcorr
short bgrcv
short rcvm
short mfeet
short polyt
short vpol
short hunass1 [120]
unsigned short formatRevisionNumber
short fixedLengthTraceFlag
short numTextHeaderExt
short hunass2 [47]

Detailed Description

VolumeViz SEGY file header.

This class encapsulates the contents of a SEGY file header (SEGY is a widely used format for storing seismic data). It is used to query this information from the SEGY file reader (see SoVRSegyFileReader::getSegyFileHeader). See also SoVRSegyTraceIdHeader.

Member Data Documentation

Binary gain recovered code:
1 = Yes
2 = No.

unsigned short SoVRSegyFileHeader::dto

Same for original field recording.

Fixed trace length flag
1: All traces in this SEG Y file are guaranteed to have the same sample interval and number of samples, as specified in hdt and hns.

2: The length of the traces in the file may vary and the number of samples in ns of the Trace Header must be examined to determine the actual length of each trace.

CDP fold expected per CDP ensemble.

data sample format code:
0 = Fixed point (1 bytes)
1 = Floating point (4 bytes)
2 = Fixed point (4 bytes)
3 = Fixed point (2 bytes)
4 = Fixed point w/ gain code (4 bytes)
5 = Floating point IEEE (4 bytes)
6 = Signed integer (1 byte)
7 = Not currently used
8 = Two's complement integer (1 byte)

SEG Y Format Revision Number, 0x0100 for revision 1.0.

Correlated data traces code:
1 = No
2 = Yes.

unsigned short SoVRSegyFileHeader::hdt

Sample interval in micro secs for this reel.

unsigned short SoVRSegyFileHeader::hns

Number of samples per trace for this reel.

Sweep frequency at end.

Sweep frequency at start.

Sweep length (ms).

Sweep trace taper length at end (the ending taper starts at sweep length minus the taper length at end).

Sweep trace taper length at start if tapered (the taper starts at zero time and is effective for this length).

Sweep type code:
1 = Linear
2 = Parabolic
3 = Exponential
4 = Other.

Sweep trace taper type code:
1 = Linear
2 = Cos-squared
3 = Other.



Job identification number.

Line number (only one line per reel).

Measurement system code:
1 = Meters
2 = Feet.

Number of auxiliary traces per record.

unsigned short SoVRSegyFileHeader::nso

Same for original field recording.

Number of data traces per record.

Number of 3200-byte Textual Header Extension records following the Binary Header.

Impulse signal polarity code:
1 = Increase in pressure or upward geophone case movement gives negative number on tape
2 = Increase in pressure or upward geophone case movement gives positive number on tape.

Amplitude recovery method code:
1 = None
2 = Spherical divergence
3 = AGC
4 = Other.

Reel number.

Trace number of sweep channel.

Trace sorting code:
-1 = Other
0 = Unknown
1 = As recorded (no sorting)
2 = CDP ensemble
3 = Single fold continuous profile
4 = Horizontally stacked
5 = Common source
6 = Common receiver
7 = Common offset
8 = Common mid-point.

Vibratory polarity code:.

Code Seismic signal lags pilot by
1 337.5 to 22.5 degrees
2 22.5 to 67.5 degrees
3 67.5 to 112.5 degrees
4 112.5 to 157.5 degrees
5 157.5 to 202.5 degrees
6 202.5 to 247.5 degrees
7 247.5 to 292.5 degrees
8 293.5 to 337.5 degrees

Vertical sum code:
1 = No sum
2 = Two sum.

N = N sum (N = 32,767)

The documentation for this struct was generated from the following file:

Open Inventor Toolkit reference manual, generated on 12 Sep 2022
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