Manual

June 2004 Isis® Sonar User's Manual, Volume 2 116
Table G-2. SeaBird’s CTD SEG-Y values in 2nd channel’s binary trace header
long Conductivity bytes 200-203 Conductivity, Siemens per meter times 100000
long Temperature bytes 204-207 Temperature in degrees C, times 1000
long Pressure bytes 208-211 Pressure in psia, times 1000
long SoundVelocity bytes 212-215 Computed speed of sound, times 100
See the file SEGYFMT.H for more info on how Isis uses the SEG-Y data format.
4. If saving in Q-MIPS format version 1.51 or later, the values are saved as follows:
Table G-3. SeaBird’s CTD SEG-Y format values saved in Q-MIPS footer record
float Conductivity [Q] computed Conductivity in Siemens per meter
float waterTemperature [b] computed Water Temperature in C
float Pressure [0] computed water pressure in psia
WORD soundVelocity [v] computed sound velocity in m/s times 30
WORD Turbidity [|] percent of light times 10000
See the file QMIPSFMT.H for the placement of these variables. Note that the raw
(frequency) values from the SeaBird CTD are not saved in the Q-MIPS file format;
only the computed (result) values are saved.
5. Towfish depth (computed in step 1.) is displayed in the Depth field in the
Telemetry area in the Parameter Display window.
6. If the Sensors display is open, then the following information is displayed (note
that these are the exact values stored on disk):
Appendix G: How Isis Processes CTD Data