Seismic feature class attributes

This section describes the fields in a seismic feature class.

Field	Description
Name	Feature name - usually survey name or base name of SEG-Y file
SEGYFile	Absolute path of input seismic file on SEG-Y format
TextualFileHeader	The textual file header (EBCDIC header) in the SEG-Y file
URL	Absolute or relative path of the resulting file. Se URL examples below
Droid	If exported from Petrel: reference to cube within Petrel project.
SeismicZDomain	The Z domain of the seismic. Time or depth
SeismicZUnit	The unit of the Z domain of the seismic. 'ms', 'us', 'ns' or 'ps', for time domain, 'm', 'cm',
JobIdNo	From SEG-Y binary file header: Job identification number
LineNo	From SEG-Y binary file header: Line number
ReelNo	From SEG-Y binary file header: Reel number
NoOfDataTracesPerRec	From SEG-Y binary file header: Number of data traces per ensemble
NoOfAuxTracesPerRec	From SEG-Y binary file header: Number of auxiliary traces per ensemble
SampleInterval	From SEG-Y binary file header: Sample interval in microseconds
OrigSampleInterval	From SEG-Y binary file header: Sample interval in microseconds of original recording
NoOfSamplesPerTrace	From SEG-Y binary file header: Number of samples per data trace
OrigNoOfSamples	From SEG-Y binary file header: Number of samples per data trace for original recording
DataSampleFormatCode	From SEG-Y binary file header: Data sample format code
CdpFold	From SEG-Y binary file header: Ensemble fold
TraceSortingCode	From SEG-Y binary file header: Trace sorting code
SpMin	Minimum shot point number read from file. 2D only
SpMax	Maximum shot point number read from file. 2D only
SpStep	Step between shot points read from file. 2D only
InlMin	Minimum in-line number read from file. 3D only
InlMax	Maximum in-line number read from file. 3D only
InlStep	Step between in-lines read from file. 3D only
CrlMin	Minimum cross line number read from file. 3D only
CrlMax	Maximum cross line number read from file. 3D only
CrlStep	Step between cross lines read from file. 3D only
SampleMin	Minimum sample value of dataset
SampleMax	Maximum sample value of dataset
DelayRecTime	Delay recording time: the minimum Z value of dataset, in milliseconds
OriginX	X position of first inline and first crossline
OriginY	Y position of first inline and first crossline
EndFirstInlineX	X position of first inline and last crossline
EndFirstInlineY	Y position of first inline and last crossline
EndFirstCrosslineX	X position of first crossline and last inline
EndFirstCrosslineY	Y position of first inline and last crossline
SchemaVersion	The scema version of this featureclass
Dimension	Integer value. The value '2' for seismic lines, and '3' for seismic cubes.
FileSize_MB	The file size of the original Segy file in Megabytes
LastModified	Date and time of last modification to the file.
NoOfTraces	Number of traces in the Segy file
NoOfInvalidTraces	Number of invalid traces in the segy file.
SampleAvg	Average seismic sample value
SampleStdDev	Standard Deviation of the seismic samples
Histogram	Histogram of the seismic samples

URL Examples:

For a ZGY file on a local disk at C:/example/seismicdata.zgy the URL will be:

file:///C:/example/seismicdata.zgy

For inline crossline and timeslice on disk stored as .tiff files named C:/example/seismicdata_crosslines.tif, C:/example/seismicdata_inlines.tif and C:/example/seismicdata_timeslices.tif the URL will be:

file:///c:/example/seismicdata.tif

For a seismic 2D line raster stored in the same file geodatabase as the featureclass with the name "seismicdata" the URL will be:

urn:name:seismicdata

Schema Versions:

Schema Version 3:

Prior to Schema 3 shot point attributes are stored as integer numbers. From Schema 3 shot point attributes are stored as decimal numbers.

Schema Version 4:

Prior to Schema 4 the sample interval was always stored in micro seconds. From Schema 4 the unit of the sample interval is read from the column 'SeismicZUnit'.