DAS/IMET System & File Format
The DAS system collects data at an operator selected interval; this is
typically set at one sample (saved) per minute. The data collected are from the
IMET sensors, SBE-21 Themosalinograph, Bathy-2000 and Winch systems. The data
are time, date and position tagged. A new data file is started each GMT day at
00:00 and ends at 23:59 (depending on the data storage interval).
Near realtime DAS data can be displayed on any of the ships computers. Click DAS Data on the Thompson Home page.
The file configuration for DAS files TN133DAS.XXX follows:
Value 1 = Nav computer GMT date - (dd/mm/yyyy)
Value 2 = Nav computer GMT time - (hh:mm:ss)
Value 3 = Nav computer latitude - (+/-dd.dddddd)
Value 4 = Nav computer longitude - (+/-ddd.dddddd)
Value 5 = Gyro compass heading - (degrees true)
Value 6 = Nav computer COG - (degrees true)
Value 7 = Doppler speed log - (knots)
Value 8 = Nav computer SOG - (knots)
Value 9 = Thermosalinograph sea temperature - (degrees C)
Value 10 = Thermosalinograph sea conductivity - (Siemens/meter)
Value 11 = Thermosalinograph sea salinity - (PSU)
Value 12 = Thermosalinograph chlorophyll - (volts)
Value 13 = Thermosalinograph light transmission - (volts)
Value 14 = Water Depth - (meters)
Value 15 = IMET air temperature - (degrees C)
Value 16 = IMET relative humidity - (percent)
Value 17 = IMET barometric pressure - (millibars)
Value 18 = PAR - (microEinsteins per square meter per second)
Value 19 = IMET short wave radiation - (watts/square meter)
Value 20 = Wind speed true - (knots)
Value 21 = Wind direction true - (degrees)
Value 22 = Average true wind speed - (knots)
Value 23 = Average true wind direction - (degrees)
Value 24 = Sound Velocity - (meters/second)
Value 25 = Winch ID. number - (see note below)
Value 26 = Wire out - (meters)
Value 27 = Wire rate - (meters/minute)
Value 28 = Wire tension - (lbs.)
Winch ID. =
0 = Hydro Winch 1
1 = Trawl Winch
2 = Hydro Winch 2
Example DAS file from cruise TN133
Filename: TN133DAS.255
Note: DAS data files are found on the server "indian" in the
directory /tgt-data/das
Last Updated 02 February 2004
Please send your questions or comments to: Webmaster@Thompson