segy.cpp File Reference

#include "OutputFormat/segy.h"
#include "Basic/Utilities.hpp"
#include "Basic/File.hpp"
#include "Db/Db.hpp"
#include "Db/DbGrid.hpp"
#include "geoslib_old_f.h"
#include "geoslib_enum.h"
#include <stdio.h>
#include <string.h>
#include <math.h>

Classes
struct	RefPt
struct	RefStats

Macros
#define	MAT(i, j)   (mat[2 * (i) + (j)])
#define	SWAP_INT16(x)   (x) = ((0x00ff & ((x))>>8) | (0xff00 & ((x))<<8))
#define	SWAP_INT32(x)

Functions
void	st_get_trace_params (traceHead *Theader, int *iline, int *xline, double *delta, double *xtrace, double *ytrace)
SegYArg	segy_array (const char *filesegy, DbGrid *surf2D, const String &top_name, const String &bot_name, const String &top_aux, const String &bot_aux, double thickmin, int option, int nz_ss, int verbOption, int iline_min, int iline_max, int xline_min, int xline_max, double modif_high, double modif_low, double modif_scale)
Grid	segy_summary (const char *filesegy, DbGrid *surf2D, const String &name_top, const String &name_bot, double thickmin, int option, int nz_ss, int verbOption, int iline_min, int iline_max, int xline_min, int xline_max, double modif_high, double modif_low, double modif_scale)
int	db_segy (const char *filesegy, DbGrid *grid3D, DbGrid *surf2D, const String &name_top, const String &name_bot, double thickmin, int option, int nz_ss, int verbOption, int iline_min, int iline_max, int xline_min, int xline_max, double modif_high, double modif_low, double modif_scale, const NamingConvention &namconv)

Macro Definition Documentation

MAT

#define MAT	(		i,
			j
	)		(mat[2 * (i) + (j)])

SWAP_INT16

#define SWAP_INT16

(

x

)

(x) = ((0x00ff & ((x))>>8) | (0xff00 & ((x))<<8))

SWAP_INT32

#define SWAP_INT32

(

x

)

Value:

(x) = ((0x000000ff & ((x))>>24) | \
                             (0x0000ff00 & ((x))>>8) |  \
                             (0x00ff0000 & ((x))<<8) |  \
                             (0xff000000 & ((x))<<24))

Function Documentation

db_segy()

int db_segy	(	const char *	filesegy,
		DbGrid *	grid3D,
		DbGrid *	surf2D,
		const String &	name_top,
		const String &	name_bot,
		double	thickmin,
		int	option,
		int	nz_ss,
		int	verbOption,
		int	iline_min,
		int	iline_max,
		int	xline_min,
		int	xline_max,
		double	modif_high,
		double	modif_low,
		double	modif_scale,
		const NamingConvention &	namconv
	)

Read the contents of a SEGY file

Returns

Error return code

Parameters

[in]	filesegy	Name of the SEGY file
[in]	grid3D	Db containing the resulting 3-D grid
[in]	surf2D	Db containing the top, Bottom and Reference surfaces This file is optional
[in]	name_top	Rank of variable containing the Top Surface (or 0)
[in]	name_bot	Rank of variable containing the Bottom Surface (or 0)
[in]	thickmin	Minimum thickness (or 0)
[in]	option	Flattening option: 0 no flattening; 1 flattening from top; -1 flattening from bottom -2 squeeze and stretch option 2 averaging from 3-D to 2-D
[in]	nz_ss	Deprecated argument
[in]	verbOption	Verbose option
[in]	iline_min	Minimum Inline number included (if defined)
[in]	iline_max	Maximum Inline number included (if defined)
[in]	xline_min	Minimum Xline number included (if defined)
[in]	xline_max	Maximum Xline number included (if defined)
[in]	modif_high	Upper truncation (when defined)
[in]	modif_low	Lower truncation (when defined)
[in]	modif_scale	Scaling value (when defined)
[in]	namconv	Naming convention

: In the case of Squeeze and Stretch (S&S), the number of layers

: is meaningless. It is fixed by the user, unless defined

: by the output grid (if flag_store == 1)

Remarks

For filling the 3-D grid

- 2-D characteristics of the grid are taken into account

- no attention is paid to the vertical mesh value.

segy_array()

SegYArg segy_array	(	const char *	filesegy,
		DbGrid *	surf2D,
		const String &	top_name,
		const String &	bot_name,
		const String &	top_aux,
		const String &	bot_aux,
		double	thickmin,
		int	option,
		int	nz_ss,
		int	verbOption,
		int	iline_min,
		int	iline_max,
		int	xline_min,
		int	xline_max,
		double	modif_high,
		double	modif_low,
		double	modif_scale
	)

Read the contents of a SEGY file

Returns

A SegYArg structure which contains:

- a vector of trace vectors

- a vector of trace descriptors

The Descriptor for each trace contains:

0: Absolute rank for the trace number

1: Cross-Line number

2: In-Line number

3: Coordinate along X

4: Coordinate along Y

5: Minimum Elevation

6: Maximum Elevation

7: Minimum Value

8: Maximum value

9: Thickness

10: Number of values

11: Minimum Elevation of Auxiliary surface

12: Maximum Elevation of Auxiliary surface

Parameters

[in]	filesegy	Name of the SEGY file
[in]	surf2D	Db containing the top, Bottom and Reference surfaces This file is optional
[in]	top_name	Name of variable containing the Top Surface (or "")
[in]	bot_name	Name of variable containing the Bottom Surface (or "")
[in]	top_aux	Name of auxiliary variable containing a Top (or "")
[in]	bot_aux	Name of auxiliary variable containing a Top (or "")
[in]	thickmin	Minimum thickness (or 0)
[in]	option	Flattening option: 0 no flattening; 1 flattening from top; -1 flattening from bottom -2 squeeze and stretch option 2 averaging from 3-D to 2-D
[in]	nz_ss	Number of layers for different options (see details)
[in]	verbOption	Verbose option
[in]	iline_min	Minimum Inline number included (if defined)
[in]	iline_max	Maximum Inline number included (if defined)
[in]	xline_min	Minimum Xline number included (if defined)
[in]	xline_max	Maximum Xline number included (if defined)
[in]	modif_high	Upper truncation (when defined)
[in]	modif_low	Lower truncation (when defined)
[in]	modif_scale	Scaling value (when defined)

In the case of Squeeze and Stretch (S&S), the number of layers

is meaningless. It is fixed by the user.

segy_summary()

Grid segy_summary	(	const char *	filesegy,
		DbGrid *	surf2D,
		const String &	name_top,
		const String &	name_bot,
		double	thickmin,
		int	option,
		int	nz_ss,
		int	verbOption,
		int	iline_min,
		int	iline_max,
		int	xline_min,
		int	xline_max,
		double	modif_high,
		double	modif_low,
		double	modif_scale
	)

Read the contents of a SEGY file and returns the structure SegyRead which captures the main characteristics of the SEGY grid

Parameters

[in]	filesegy	Name of the SEGY file
[in]	surf2D	Db containing the top, Bottom and Reference surfaces This file is optional
[in]	name_top	Rank of variable containing the Top Surface (or 0)
[in]	name_bot	Rank of variable containing the Bottom Surface (or 0)
[in]	thickmin	Minimum thickness (or 0)
[in]	option	Flattening option: 0 no flattening; 1 flattening from top; -1 flattening from bottom -2 squeeze and stretch option 2 averaging from 3-D to 2-D
[in]	nz_ss	Number of layers for different options (see details)
[in]	verbOption	Verbose option
[in]	iline_min	Minimum Inline number included (if defined)
[in]	iline_max	Maximum Inline number included (if defined)
[in]	xline_min	Minimum Xline number included (if defined)
[in]	xline_max	Maximum Xline number included (if defined)
[in]	modif_high	Upper truncation (when defined)
[in]	modif_low	Lower truncation (when defined)
[in]	modif_scale	Scaling value (when defined)

: In the case of Squeeze and Stretch (S&S), the number of layers

: is meaningless. It is fixed by the user, unless defined

: by the output grid (if flag_store == 1)

st_get_trace_params()

void st_get_trace_params	(	traceHead *	Theader,
		int *	iline,
		int *	xline,
		double *	delta,
		double *	xtrace,
		double *	ytrace
	)

Get Trace characteristics