jfoshee / unpluggedsegy

SEG-Y Reading in C#

SEG-Y Reading Library in C#

SEG-Y is a file format for seismic image data. It is also known as SEGY or SGY.

Issues and sample data welcome.

Example

using System;
using Unplugged.Segy;

var reader = new SegyReader();
ISegyFile line = reader.Read(@"RMOTC Seismic data set\2D_Seismic\NormalizedMigrated_segy\lineA.sgy");
ITrace trace = line.Traces[0];
double mean = 0;
double max = double.MinValue;
double min = double.MaxValue;
foreach (var sampleValue in trace.Values)
{
    mean += sampleValue / trace.Values.Count;
    if (sampleValue < min) min = sampleValue;
    if (sampleValue > max) max = sampleValue;
}
Console.WriteLine(min);
Console.WriteLine(max);
Console.WriteLine(mean);

Supported Sample Formats

• IBM Floating Point 4 (Big Endian)
• IEEE Floating Point 4 (Little Endian)
• Two's Complement Integer 4 (Big and Little Endian)
• Two's Complement Integer 2 (Big and Little Endian)
• Two's Complement Integer 1

Current Known Limitations

• Assumed to be built on Little Endian architecture
• Sample Format not supported: Fixed Point With Gain 4
• Extended Text Headers are not supported
• Writing SEGY files is not supported

If you have example files of unsupported formats or feature requests, they would be appreciated! Please, send to [email protected]

Acknowledgements

Example data is courtesy of the Rocky Mountian Oilfield Testing Center and the U.S. Department of Energy

Resources on the SEG-Y format:

• http://walter.kessinger.com/work/segy.html
• http://en.wikipedia.org/wiki/SEG_Y
• http://www.seg.org/documents/10161/77915/seg_y_rev1.pdf

unpluggedsegy's Issues

when i open xx.sgy file.then throw a Exception, System.OverflowException?

System.OverflowException
HResult=0x80131516
Message=算术运算导致溢出。
Source=Unplugged.Segy
StackTrace:
在 Unplugged.Segy.SegyReader.ReadTrace(BinaryReader reader, FormatCode sampleFormat, Int32 sampleCount, Boolean isLittleEndian)
在 Unplugged.Segy.SegyReader.ReadTrace(BinaryReader reader, FormatCode sampleFormat, Boolean isLittleEndian)
在 Unplugged.Segy.SegyReader.Read(Stream stream, Int32 traceCount, IReadingProgress progress)
在 Unplugged.Segy.SegyReader.Read(Stream stream, IReadingProgress progress)
在 Unplugged.Segy.SegyReader.Read(String path, IReadingProgress progress)
在 Aeroiot.Win1.Form1.sgy_btn_Click(Object sender, EventArgs e) 在 D:\DEV\Aeroiot.WinForm\Aeroiot.Win1\Form1.cs 中: 第 40 行
在 System.Windows.Forms.Control.OnClick(EventArgs e)
在 Sunny.UI.UIButton.OnClick(EventArgs e) 在 D:\DEV\Aeroiot.WinForm\SunnyUI\Controls\UIButton.cs 中: 第 80 行
在 System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
在 System.Windows.Forms.Control.WndProc(Message& m)
在 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
在 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
在 System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
在 System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
在 System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
在 System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
在 System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
在 System.Windows.Forms.Application.Run(Form mainForm)
在 Aeroiot.Win1.Program.Main() 在 D:\DEV\Aeroiot.WinForm\Aeroiot.Win1\Program.cs 中: 第 19 行