SoVRSegyFileHeader Struct Reference
[Readers]

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

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

short SoVRSegyFileHeader::bgrcv

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

unsigned short SoVRSegyFileHeader::dto

Same for original field recording.

short SoVRSegyFileHeader::fixedLengthTraceFlag

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.

short SoVRSegyFileHeader::fold

CDP fold expected per CDP ensemble.

short SoVRSegyFileHeader::format

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)

unsigned short SoVRSegyFileHeader::formatRevisionNumber

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

short SoVRSegyFileHeader::hcorr

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.

short SoVRSegyFileHeader::hsfe

Sweep frequency at end.

short SoVRSegyFileHeader::hsfs

Sweep frequency at start.

short SoVRSegyFileHeader::hslen

Sweep length (ms).

short SoVRSegyFileHeader::hstae

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

short SoVRSegyFileHeader::hstas

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

short SoVRSegyFileHeader::hstyp

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

short SoVRSegyFileHeader::htatyp

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

short SoVRSegyFileHeader::hunass1[120]

Unassigned.

short SoVRSegyFileHeader::hunass2[47]

Unassigned.

int SoVRSegyFileHeader::jobid

Job identification number.

int SoVRSegyFileHeader::lino

Line number (only one line per reel).

short SoVRSegyFileHeader::mfeet

Measurement system code:
1 = Meters
2 = Feet.

short SoVRSegyFileHeader::nart

Number of auxiliary traces per record.

unsigned short SoVRSegyFileHeader::nso

Same for original field recording.

short SoVRSegyFileHeader::ntrpr

Number of data traces per record.

short SoVRSegyFileHeader::numTextHeaderExt

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

short SoVRSegyFileHeader::polyt

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.

short SoVRSegyFileHeader::rcvm

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

int SoVRSegyFileHeader::reno

Reel number.

short SoVRSegyFileHeader::schn

Trace number of sweep channel.

short SoVRSegyFileHeader::tsort

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.

short SoVRSegyFileHeader::vpol

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

short SoVRSegyFileHeader::vscode

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:

• VolumeViz/readers/SoVRSegyReader.h