/// <summary>
/// Returns a new LDF channel
/// </summary>
public new LDF_Channel GetNewChannel(string name, string unit, string description)
{
LDF_Channel lc = new LDF_Channel(this, name, unit);
lc.Description = description;
return(lc);
}
/// <summary>
/// Creates a deep copy of a given channel
/// </summary>
/// <param name="c"></param>
public override Oilfield_Channel Clone()
{
LDF_Channel tmp = new LDF_Channel();
tmp.Name = this.Name;
tmp.Unit = this.Unit;
tmp.Description = this.Description;
tmp.DepthOffset = this.DepthOffset;
tmp.Decimals_Count = this.Decimals_Count;
tmp.Format = this.Format;
tmp.PaddedWidth = this.PaddedWidth;
tmp.ValidCount = this.ValidCount;
tmp.MissingCount = this.MissingCount;
tmp.DataStart = this.DataStart;
tmp.DataEnd = this.DataEnd;
tmp.DataStartIndex = this.DataStartIndex;
tmp.DataEndIndex = this.DataEndIndex;
tmp.MinValue = this.MinValue;
tmp.MaxValue = this.MaxValue;
tmp.Average = this.Average;
foreach (Oilfield_Constant d in this.Parameters)
{
tmp.Parameters.Add(d.Clone());
}
foreach (double d in this.Data)
{
tmp.Data.Add(d);
}
return(tmp);
}
/// <summary>
/// Returns a new LDF channel
/// </summary>
public LDF_Channel GetNewChannel(LDF_Channel template)
{
LDF_Channel c = (LDF_Channel)template.Clone();
LDF_Channel index = GetIndex();
if (c != null)
{
c.Data.Clear();
for (int i = 0; i < index.Data.Count; i++)
{
c.Data.Add(Double.NaN);
}
}
return(c);
}
/// <summary>
/// Returns the LDF channel, creating one as necessary
/// </summary>
public new LDF_Channel GetOrCreateChannel(string name, string unit, string description, string format)
{
LDF_Channel c = GetChannel(name);
if (c != null)
{
return(c);
}
c = GetIndexCopy();
c.Name = name;
c.Unit = unit;
c.Description = description;
c.Format = format;
Channels.Add(c);
return(c);
}
private void ParseFile(bool readdata)
{
FileStream fs = null;
try
{
fs = File.Open(FileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
fs.Read(CommonHeader, 0, CommonHeader.Length);
foreach (LDF_Constant c in Constants)
{
c.GetBuffer(CommonHeader);
}
long nsamples = Convert.ToInt64(GetConstant("Number of Samples"));
double interval = Convert.ToDouble(GetConstant("Sampling Rate"));
string trace_measures = GetConstant("Along Measurement");
if (interval <= 0.0)
{
SetConstant("Sampling Rate", "1.0");
interval = 1.0;
}
// TODO -- change the along trace units as necessary
LDF_Channel index = (trace_measures.ToUpper().StartsWith("D"))?
new LDF_Channel(this, "Depth", "m") : new LDF_Channel(this, "Time", "ms");
if (readdata)
{
for (int i = 0; i < nsamples; i++)
{
index.Data.Add(interval * i);
}
}
Channels.Add(index);
// Unlike SEG-Y, the traces in the LDF are always 4-byte floats
// The trace header length is always 588 bytes
long channelLength = 588L + (nsamples << 2);
byte[] Buffer = new byte[channelLength];
int traceCount = 0;
// Note that in the LDF files all length units are in always ft
// For most applications a conversion on the flight is required
string globUnit = (GetConstant("Across Measurement") == "ft") ? "ft" : "m";
int ntraces = Convert.ToInt32(GetConstant("Number of Levels"));
// Read the file by the declared number of traces
for (int i = 0; i < ntraces; i++)
{
int read = fs.Read(Buffer, 0, Buffer.Length);
if (read < Buffer.Length)
{
break;
}
// LDF_Channel c = new LDF_Channel(traceCount.ToString(), "sample", Buffer, readdata);
// foreach (LDF_Constant cc in c.Parameters)
// {
// if (cc.Unit == "unitless") continue;
// if (cc.Unit == "elevation") cc.Unit = globUnit;
// if (cc.Unit == "coordinate") cc.Unit = globUnit;
// if (cc.Unit == "velocity") cc.Unit = globUnit + "/s";
// }
// this.Channels.Add(c);
traceCount++;
}
// Determine how much left at the end
// This may be a processing history or EBCDIC text
long historyLocation = fs.Position;
long historyLength = fs.Length - historyLocation;
if (historyLength > 0L)
{
ProcessingHistory = new byte[historyLength];
fs.Read(ProcessingHistory, 0, ProcessingHistory.Length);
}
SetConstant("Number of Levels", traceCount.ToString());
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (fs != null)
{
fs.Close();
}
}
}
/// <summary>
/// Returns the shallow copy of LDF channel
/// </summary>
public new LDF_Channel GetChannel(string name)
{
LDF_Channel lc = (LDF_Channel)base.GetChannel(name);
return(lc);
}
/// <summary>
/// Returns the shallow copy of LAS channel
/// </summary>
public new LDF_Channel GetChannel(int index)
{
LDF_Channel lc = (LDF_Channel)base.GetChannel(index);
return(lc);
}
