tracegeom Struct Reference

#include <traceio.h>

List of all members.

Public Attributes

int nrec

number of shot records in data

int irec

index of current record (most recently accessed)

int xrec

index of next record to be accessed

int first

index of first record (in group)

int last

index of last record (in group)

int * ntr

number of traces per shot record

off_t * recoff

file offset of first trace in record

RPNT * src

source coordinates - index convention is z=0, x=1, y=2

int ntraces

number of traces in this record with receivers in grid cells

IPNT * ig

receiver index array in grid

RPNT * rg

receiver relative coordinates within grid cell (betw 0 and 1)

IPNT is

source index array in grid

RPNT rs

source relative x coordinate within grid cell (betw 0 and 1)

IPNT axord

axis order array

int nt

number of time samples in simulation

int ntout

number of time samples to be output (may differ from nt)

float dt

time step for simulation

float dtout

time step for output (may differ from dt)

int dtmus

int repn of dt in microseconds

float tmax

max time

float t0

min time

float t0out

min time for output (may differ from t0)

int * tracl

tracl - trace number within line (SEGY)

int * tracr

tracr - trace number within record (SEGY)

int * fldr

fldr - field record numer (SEGY)

int * tracf

trace number within field record (SEGY)

int scalel

scale factor for elevations (SEGY)

int scalco

scale factor for offsets (SEGY)

float * buf

buffer for trace data

int interp

interpolation flag

int ndim

grid dimension

ireal dvol

grid cell volume

FILE * fpin

input file pointer

FILE * fpout

output file pointer

off_t * troff

offset of trace in file

Detailed Description

tracegeom

Trace Geometry. Consists of struct defining sampling etc. and storing essential trace header and i/o status information, together with constructor, initializer, destructor, sampler, writer, and printer functions. The struct stores information for only one shot record at a time. Constructor connects the object to header (trace input) and data (trace output) files, which may be the same. Initializer populates the struct with data from the next shot record, read from the header file; this data includes all essential header words and may include trace samples. Sampler interacts with a grid, extracting samples at trace locations and storing them in the trace buffer data member of the struct. Writer dumps the current trace buffer to the data file. These functions rely on an internal traceserver object, which hides details of parallelism and data distribution.

Definition at line 50 of file traceio.h.

Member Data Documentation

int tracegeom::nrec

number of shot records in data

Definition at line 53 of file traceio.h.

int tracegeom::irec

index of current record (most recently accessed)

Definition at line 55 of file traceio.h.

int tracegeom::xrec

index of next record to be accessed

Definition at line 57 of file traceio.h.

int tracegeom::first

index of first record (in group)

Definition at line 59 of file traceio.h.

int tracegeom::last

index of last record (in group)

Definition at line 61 of file traceio.h.

int* tracegeom::ntr

number of traces per shot record

Definition at line 64 of file traceio.h.

off_t* tracegeom::recoff

file offset of first trace in record

Definition at line 67 of file traceio.h.

RPNT* tracegeom::src

source coordinates - index convention is z=0, x=1, y=2

Definition at line 70 of file traceio.h.

int tracegeom::ntraces

number of traces in this record with receivers in grid cells

Definition at line 72 of file traceio.h.

IPNT* tracegeom::ig

receiver index array in grid

Definition at line 75 of file traceio.h.

RPNT* tracegeom::rg

receiver relative coordinates within grid cell (betw 0 and 1)

Definition at line 78 of file traceio.h.

IPNT tracegeom::is

source index array in grid

Definition at line 80 of file traceio.h.

RPNT tracegeom::rs

source relative x coordinate within grid cell (betw 0 and 1)

Definition at line 82 of file traceio.h.

IPNT tracegeom::axord

axis order array

Definition at line 84 of file traceio.h.

int tracegeom::nt

number of time samples in simulation

Definition at line 86 of file traceio.h.

int tracegeom::ntout

number of time samples to be output (may differ from nt)

Definition at line 88 of file traceio.h.

float tracegeom::dt

time step for simulation

Definition at line 90 of file traceio.h.

float tracegeom::dtout

time step for output (may differ from dt)

Definition at line 92 of file traceio.h.

int tracegeom::dtmus

int repn of dt in microseconds

Definition at line 94 of file traceio.h.

float tracegeom::tmax

max time

Definition at line 96 of file traceio.h.

float tracegeom::t0

min time

Definition at line 98 of file traceio.h.

float tracegeom::t0out

min time for output (may differ from t0)

Definition at line 100 of file traceio.h.

int* tracegeom::tracl

tracl - trace number within line (SEGY)

Definition at line 103 of file traceio.h.

int* tracegeom::tracr

tracr - trace number within record (SEGY)

Definition at line 106 of file traceio.h.

int* tracegeom::fldr

fldr - field record numer (SEGY)

Definition at line 109 of file traceio.h.

int* tracegeom::tracf

trace number within field record (SEGY)

Definition at line 112 of file traceio.h.

int tracegeom::scalel

scale factor for elevations (SEGY)

Definition at line 114 of file traceio.h.

int tracegeom::scalco

scale factor for offsets (SEGY)

Definition at line 116 of file traceio.h.

float* tracegeom::buf

buffer for trace data

Definition at line 118 of file traceio.h.

int tracegeom::interp

interpolation flag

Definition at line 120 of file traceio.h.

int tracegeom::ndim

grid dimension

Definition at line 122 of file traceio.h.

ireal tracegeom::dvol

grid cell volume

Definition at line 124 of file traceio.h.

FILE* tracegeom::fpin

input file pointer

Definition at line 126 of file traceio.h.

FILE* tracegeom::fpout

output file pointer

Definition at line 128 of file traceio.h.

off_t* tracegeom::troff

offset of trace in file

Definition at line 131 of file traceio.h.

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

traceio.h


Public Attributes
int	nrec
	number of shot records in data
int	irec
	index of current record (most recently accessed)
int	xrec
	index of next record to be accessed
int	first
	index of first record (in group)
int	last
	index of last record (in group)
int *	ntr
	number of traces per shot record
off_t *	recoff
	file offset of first trace in record
RPNT *	src
	source coordinates - index convention is z=0, x=1, y=2
int	ntraces
	number of traces in this record with receivers in grid cells
IPNT *	ig
	receiver index array in grid
RPNT *	rg
	receiver relative coordinates within grid cell (betw 0 and 1)
IPNT	is
	source index array in grid
RPNT	rs
	source relative x coordinate within grid cell (betw 0 and 1)
IPNT	axord
	axis order array
int	nt
	number of time samples in simulation
int	ntout
	number of time samples to be output (may differ from nt)
float	dt
	time step for simulation
float	dtout
	time step for output (may differ from dt)
int	dtmus
	int repn of dt in microseconds
float	tmax
	max time
float	t0
	min time
float	t0out
	min time for output (may differ from t0)
int *	tracl
	tracl - trace number within line (SEGY)
int *	tracr
	tracr - trace number within record (SEGY)
int *	fldr
	fldr - field record numer (SEGY)
int *	tracf
	trace number within field record (SEGY)
int	scalel
	scale factor for elevations (SEGY)
int	scalco
	scale factor for offsets (SEGY)
float *	buf
	buffer for trace data
int	interp
	interpolation flag
int	ndim
	grid dimension
ireal	dvol
	grid cell volume
FILE *	fpin
	input file pointer
FILE *	fpout
	output file pointer
off_t *	troff
	offset of trace in file