Create Depth Channel
Use the Database Tools > Array Channels > Create Depth Channel menu option (VSCTDPCH GX) to create a depth (array) channel.
Create Depth Channel dialog options
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Depth (array) channel name
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Specify depth channel name.
Script Parameter: VSCTDPCH.DEPCH
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Definition method
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Depth channel values creation method:
1 – Linearly increasing depths (default). Specify the first value s and the increment d, the n-th value is s + d*(n-1).
2 – Geometric progression depth. Specify the first value s and the common ratio r, the n-th value is s * r^(n-1).
3 – Exponentially increasing depths. Specify the first value s and the number of values per decade m, the n-th value is s * exp((n-1)/m).
For instance 4 items per decade, beginning at a depth of 1 would give the following depths: 1, 1.78, 3.16, 5.62 and 10.0, etc. The first value in the series must be greater than zero.
4 – From depth file. See the Application Notes below.
Script Parameter: VSCTDPCH.DEPMETHOD – 1: Linear 2: Geometric 3: Exponential 4: From file
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Reference data (array) channel
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Select data channel as reference channel from the list. This must be an array channel.
The created depth channel will have the same column size as this reference channel.
Script Parameter: VSCTDPCH.REFCH
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Line process:
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Select the lines to process. The options are the currently displayed line, the selected lines and all the lines (the default).
Script Parameter: VSCTDPCH.LINESEL - "A" : All lines (default), "S" : Selected lines, "D" : Displayed line
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Next
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Select the Next button to pup out a secondary dialog to enter the parameters for different methods:
"Starting depth" and "Increment" for Linear method.
"Starting depth" and "Common ratio" for Geometric method.
"Starting depth" and "Number of depths per decade" for Exponential method.
"Depth file name" for From depth file method.
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Application Notes
The depth file is an ASCII text file that lets you specify different depths for different lines. It consists of two types of data blocks. The "All (Common) Lines" block specifies depths for all lines not specifically identified in the "individual line" blocks. Each data block consists of the block name (‘All (Common) Lines’ or individual line name), data lines separated by comma or space, and the "end" line. Following is an example (depth channel with column size 20):
/ Depth file
All (Common) Lines
0, 5, 10, 15, 20, 25, 30, 35, 40, 45,
50, 55, 60, 65, 70, 75, 80, 85, 90, 95
end
L100:
0, 10, 20, 30, 40, 50, 60, 70, 80, 90,
100,110,120,130,140,150,160,170,180,190,
end
Depth channel created from this depth file will have depth values of 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 for all lines except line L100 which will have depth values of 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100,110,120,130,140,150,160,170,180,190.
If the number of data values exceeds the depth channel column size, the extra values will be ignored.
If the number of data values is smaller than the depth channel column size, the dummy value will be filled for the rest of elements.
