SEG-Y Reader
G-Viewer allow conveniently load and review multiple seismic datasets. While free version allows load only single dataset each time, the commercial license allows to load and manipulate multiple seismic dataset. When related to similar survey, it becomes easy to compare different versions of same line and preserve zooming on the same area. SEG-Y Reader SEG-Y Reader reads 2D and 3D SEG-Y format data files and exports them to formats that may be loaded into GM-SYS Profile and/or Oasis montaj for 2D- and 3D-displays. Supported output formats include: Geosoft Database (2D & 3D SEG-Y). Each trace is loaded into a database row. Samples and sample depths are stored as array channels. Create a new SEGY file from an n-dimentional array. Create a structured SEGY file with defaulted headers from a 2-, 3- or 4-dimensional array. Ilines, xlines, offsets and samples are inferred from the size of the array. Please refer to the documentation for functions fromarray2D, fromarray3D and fromarray4D to see how the arrays are interpreted. SEG-Y start sweep freq. 157-158 79 139 iyrptr year data was recorded. 159-160 80 140 idayptr day of year 161-162 81 141 ihrptr hour of day 163-164 82 142 iminptr minute of hour 165-166 83 143 isecptr second of minute 167-168 84 144 igmtptr 1=local, 2=gmt sometimes used for milliseconds of shot The SEGY standard designates BYTES 181-240 as. Get Get the package from NuGet. NuGet is a 'package manager' for Visual Studio. It helps when adding references to public libraries. Get the Visual Studio Extension; After installing, right click on your project and select Manage NuGet Packages; Search for Unplugged.Segy and click Install.
SEG-Y is a widely used format for storing seismic trace data, defined by the Society of Exploration Geophysicists publication 'Digital Tape Standards' (http://www.seg.org). Open Inventor Toolkit provides an SEG-Y reader for loading seismic traces, lines, and volumes. The reader supports all sizes of integer and float data, and can correctly determine the number of samples per trace in most cases. The reader also allows specifying custom byte offsets in trace headers to import datasets that do not follow standard SEG-Y encoding.
In some cases, information such as line numbers and crossline numbers will be stored in non-standard locations in the header. Applications can specify the byte position of values within the header using the setSegyTraceHeaderBytePosition() method.
Information about the range of inline / crossline numbers and the range of time values can be queried using the getInlineRange(), getCrosslineRange() and getZRange() methods.
Applications can also use this class to open a SEGY file and extract information from the file without actually loading all the data. To get the SEGY text file header call getSegyTextHeader(). To get the SEGY binary file header call getSegyFileHeader(). To get the header of a specific trace call getSegyTraceHeader(). To get the values in a specific trace call getSegyTraceData().
In most cases, the SEG-Y reader can automatically detect:
- The number of traces per line is not uniform (missing traces).
- The length of traces is not uniform (missing samples).
- The values in the file need to be byte-swapped (for example the data was written on a 'big-endian' machine and is being read on a 'little-endian' machine)
- Floating-point values were written in IEEE or IBM format (the format field in the SEG-Y header should specify this but is not always correct).
If the SEGY reader fails to read the file correctly, you can set various environment variables to specify correct handling for the above conditions. You can also debug the reading process by setting:
- IVVR_SEGY_DEBUG=1 This outputs information about what the reader is actually doing.
- IVVR_SEGY_DUMP=filename This requests that information from the file and trace headers be written to the specified file while processing the SEGY data file.
Learn more | Online Demo | Product demo name: RemoteViz Seismic Volume
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