I/O module for Seismic Unix data

All classes and functions for Seismic Unix file data I/O. More...

Namespaces
	datrw::su
	All classes and functions to extract data from Seismic Unix files.
	datrw::su::helper
	datrw::su::options
	options to be passed between classes definitions
	datrw::su::subformat
	subformat definitions
	datrw::su::subformat::def
	default values for subformat modifiers
	datrw::su::subformat::key
	key for subformat modifiers

Classes
class	datrw::isustream
	class to read SeismicUnix data More...
class	datrw::osustream
	class to write SU data More...
struct	datrw::su::Coordinates
	full set of coordinates.This struct holds a full set of coordinates for a SEG-Y trace header. It provides functions to read the values from a given trace header and to set values in a trace header. Further it provides a function to chose equal scaling values for horizontal coordinates on one hand and vertical coordinates on the other hand. This class combines six members of type datrw::su::ScalCoo in order to scale coordinates coherently. It is used in the set functions of datrw::su::SUheader not as a member data but as a conversion and scaling tool. More...
class	datrw::su::helper::MyOutputFormat
	output format modifier for debug output More...
struct	datrw::su::options::SpatialSampling
	options to control the way spatial sampling header variables are handeled. More...
struct	datrw::su::options::SUHeaderControl
	options to control the way header variables are handeled. More...
struct	datrw::su::options::TemporalSampling
	options to control the way temporal sampling header variables are handeled. More...
struct	datrw::su::ScalCoo
	scaled coordinate.This struct holds one coordinate together with a scale value. It provides functions to support appropriate scaling and to explore dynamic range. More...
class	datrw::su::SUheader
	C++ class to handle Seismic Un*x header struct. More...
class	datrw::su::SUReadException
struct	datrw::su::TraceHeaderStruct
	SEG-Y and SU trace header as taken from segy.h coming with SeismicUnixsegy - trace identification header. More...

Functions
void	datrw::su::fixscalevalue (short &s, const bool &strict)
	fix a SeismicUn*x scale value More...
options::SUHeaderControl	datrw::su::inputmodifiers (const std::string &modifier, const bool &debug)
	evaluate input stream format modifiers More...
options::SUHeaderControl	datrw::su::outputmodifiers (const std::string &modifier, const bool &debug)
	evaluate output stream format modifiers More...
short	datrw::su::powertoscale (const int &p)
	convert a decimal power to a SeismicUn*x scale value More...
double	datrw::su::scalefactor (short s, const bool &strict)
	convert scale value to a factor to be applied More...
int	datrw::su::scaletopower (short s, const bool &strict)
	convert a SeismicUn*x scale value to a decimal power More...
const bool	datrw::su::isbinary =true
	Format properties. More...
const char *const	datrw::su::streamID ="su"
	Format properties. More...

Detailed Description

All classes and functions for Seismic Unix file data I/O.

Seismic Un*x is available from http://www.cwp.mines.edu/cwpcodes/

Special format definition within TOAST

Small sampling interval (smaller than 1 microsecond) as used in ultrasonic recordings are to be stored in SeismicUn*x data format within TOAST as follows:

1. Time values for ultrasonic data will be given in nanoseconds for dt and microseconds for delrt.
2. This applies to fields
   1. dt (byte# 117-118): sample interval
   2. delrt (byte# 109-110): delay recording time

1. Time units other than microseconds or nanoseconds for dt and milliseconds or microseconds for delrt are not allowed.
2. Field d1 (byte# 181-184) in TOAST data will be
   • either zero, indicating standard seismic data with a micro seconds time scale
   • or provide the sampling interval in seconds, thus indicating
     • either standard seismic data, if d1 in seconds matches dt if the latter is taken in microseconds
     • or ultrasonic data, if d1 in seconds matches dt if the latter is taken in nanoseconds and delrt is taken in microseconds

This way it will be possible to use SU tools to sort traces or similar or even waveform filters. The user just has to take care to pass filter frequencies in kHz rather than Hz in the case of ultrasonic data.