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REVISION
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REVISION
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1.5.1 : October 28, 2011
Fixed 'too large preallocating' in ReadSegy casing a delay
reading large files using the 'traces' option.
1.5 : October 27, 2011
ReadSegy.m : Added option 'traces' that allow fast reading of specific
traces.
When the 'minmax' option is used, the corresponding traces
are first located thorugh header files, and then data
are read using the 'traces' options.
For larger files this casues the readomh tme to decrease
significantly when using the 'minmax' option.
1.4 : April 05, 2011
ReadSegy.m : Corrected SH.time to reflect proper traveltime
Disabled Waitbar
ReadSegyHeader.m : Fixed 'SkipData' conflict with Robust Control Toolbox
wiggle.m : Allowed specification of line color,
allow overlaying wiggle plots
allow NaN value in 'VA' style plotting
ReadSu : Fixed typo in line 221
MergeSegy.m : Added mfile to merge Segy Files
1.3 : January 20, 2010
Added 'ReadSegyTraceHeaderValue' and 'WriteSegyTraceHeaderValue'
that can be used to read and write the TraceHeaderValues one by
one. Much faster that reading the whole dataset.
1.2 : January 07, 2009
Updated GUI to work for Matlab R2008a
enabled loading of partial segyfile (using time and header ranges)
from GUI (ctrl X)
enabled editing of the textual file header (both ASCII and EBCDIC)
1.11 : August 2008
Kristian Stormark (<kristian.stormark@gmail.com>) contributed a change
to GetSegyTraceHeader that reduce the number of discoperations
causing a significant speed up
1.08 : March 2007
Urs Boeniger contributed a patch that allows arbitrary
SegyTraceHeaders to be specified for WriteSegy.m
1.06 : FIxed a bug taht casue a fixed length of 5011 samples in ReadSu
1.02 : Cleaning up code to work with Octave 2.1.57
1.01 : 'jump' related fixes
1.00 : Cleaning up some Matlab 7.0 specific bugs.
0.99 : Just cleaning up to prepare for a release 1.0
0.93
ReadSegy : RAM is preallocated, causing a significant speed up
when reading large files (>30%)
0.92 April 13, 2004
DUE TO A BUG IN MATLAB 6.5 : Technical Solution Number: 31977,
writing of segy files did not work in some windows version of
matlab 6.5. A workaround have been implemeneted.
fseek(segyid,'bof',0) did not always work ?
disp statements have been replaced with SegymatVerbose, making
it easier to control verbose output to the screen. The verbose level
can be set in SegymatVerbose.m
CheckSegyTraceHeader has been implemeneted as an m-file of its own.
It was a part of PutSegyTrace but slowed down writing of segy files
considerably. Now it is only run if you edit the m-files that write
data to disc. This change gives great speed improvement.
0.91 Nov 21, 2003:
Strange bug when using ReadSegy on one platform :
"At compilation SkipData was an undefined variable or function.>> >> >> >> >> Function SkipData is now in context. To use a function that is>> >> >> >> >> not in context at compilation use FEVAL or EVAL.
"
Could not reprodice the error using the same SGY file on either Linux or Windows.
0.90 :
GUI is reimplemented.
Coded is prepared to be compiled.
Support For Extended Textual File Headers.
0.45 :
WriteSegy : 'dt' was always reported as not set, even if it were.
It did not affect the written SEGY file though.
0.44 :
ibm2num : simpler error message when transformation fails.
0.43 : June 19, 2003
ReadSegy : Crashed when SegyHeader sais Rev0 and DFS=5, since
DFS=5 is not defined for Rev0. Now, if DFS=5 is chosen Revision
is automatically set to 1.
0.42 :
GUIEditSegyHeader : Updated to handle the complete SegyHeader (30/03/2003)
GUIEditTextualFileHeader : Updated to give warning when wrong format is chosen.
ReadSegy : Rev0, data sample format 2 and 3 are now set to 2 and 4 byte signed integers.
0.41 :
ReadSegy : Fixed bug that caused ReadSegy to crash when no data was returned.
0.40 : Jan-22-2003
ReadSegy : -fixed 'endian' big introduced in version 0.39
-Implemented more robust reading of traces with varying trace lengths
Now the code will not stop running, simply return an error message.
- re-implemented the 'SkipData' option that somehow had been removed from the code
ReadSegyHeader : fixed 'endian' big introduced in version 0.39
0.39 : Jan-20-2003
ReadSegy : option to read little endian formatted data
ReadSegyHeader : Reads only the Segy Binary Header
ReadSuFast/ReadSegyFast
If headers are not required, fast version of the reading algorithms
is now available. These are up to 20 times faster.
EBCDIC support
GUIEditTextualFileHeader
GUI to display/edit the Textual Segy Header in EBCDIC/ASCII format.
0.38 : September 6-2002
WriteSegy : takes options 'revision' and 'dsf'
to set SEG-Y revision number and
Data Sample Format
WriteSegyStructure :
takes options 'revision' and 'dsf'
to set SEG-Y revision number and
Data Sample Format
ReadSegy : Takes option 'dsf' to force DataSamplingFormat
SegyHeader.FixedLengthTraceFlag is no longer forced to be 1 !
Thus now all Read and Write routines takes the options
'revsision' and 'dsf'
SegyHeader: Two fields were added that contains unassigned header values
SegyHeader.Unassigned1 : byte 3261-3500
SegyHeader.Unassigned2 : byte 3507-3600
SegyTraceheaders : Added two fields for unassigned values :
SegyTraceHeader.UnassignedInt1 : int32, Byte 232+4
SegyTraceHeader.UnassignedInt1 : Int32, Byte 236+4
0.37 : August 23-2002
Format of dt and ns changed to unsigned integers.
0.36 : August 15-2002
ReadSegy was corrupted in 0.35. Bug Fix release.
0.35 : June 16-2002
Correct DayOfYear in PutSegyTrace.m,
- thanks to Michael Toews (mwtoews@ucalgary.ca)
Minor bugfixes. Released as a release on Sourceforge.
0.33 : June 03-2002
Added Rading and writing SU and SEGY to GUI.
0.32 : May 15-2002
Colormaps and gain control is added.
0.31 : May 04-2002
GUI Segy Reader useable.
0.3 : May 01-2002
Added fascility to read in parts of a SEG-Y file
0.2 : Added 'SkipData', so that only header values are read
0.1 : Initial release