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June 2004 Isis® Sonar User's Manual, Volume 2

115

2. The following values are computed with the calibration coefficients read from the

file ISIS.CTD:

• Water temperature (degrees C)

• Pressure (psia)

• Conductivity (Siemens per meter)

Multiply Siemens per meter by 10.0 to get mmho/cm)

• Velocity of sound in water

3. If saving data in SEG-Y format, the values are saved in the first and second

channel’s binary trace header as shown in the tables, where first byte in header is

byte 0:

Table G-1. SeaBird’s CTD SEG-Y values in first channel’s binary trace header

long ConductivityFreq bytes 200-203 Siemens per meter *10000

long TemperatureFreq bytes 204-207 stored, times 10000

long PressureFreq bytes 208-211 stored, times 10

long PressureTemp bytes 212-215 stored, times 100

short Turbidity bytes 216-217 Turbidity sensor in volts, times 10000

Appendix G: How Isis Processes CTD Data

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 167 168

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