R/V Tioga Calliope metadata file Sun 14/May/2006 15:26:24 Current time zone: GMT Standard Time ================================================== Air temperature ( TMP1) Format: xxx.xx degrees Celsius __________________________________________________ Air temperature (aux) ( TMP2) Format: xx.x degrees Celsius This is a rough air temperature value obtained from the barometric pressure sensor located in a junction box on the ship's mast. Values are likely to be high during the daylight hours of sunny days. __________________________________________________ Aux air temperature (raw) ( TMP2_Raw) Format: xx.x degrees Celsius This is a rough temperature value obtained from the barometric pressure sensor located in a junction box on the ship's mast. Values are likely to be high during the daylight hours of sunny days. __________________________________________________ Barometric Pressure (BPR) Format: Barometric pressure (milli-bars) Calibration - Jan 2003 __________________________________________________ Decimal Latitude ( deg_lat) Example: 42.220669 Format: dd.dddddd __________________________________________________ Decimal Longitude ( deg_lon) Example: -71.119579 Format: ddd.dddddd __________________________________________________ Furuno RMC ( FRMC) NMEA RMC position data obtained from the Furuno NAVnet system. __________________________________________________ Furuno data ( Furuno) NMEA RMC & DPT data from the Furuno GPS and depth sounder. __________________________________________________ Furuno depth ( FDpth) NMEA depth data obtained from the Furuno NAVnet system. __________________________________________________ GPS Date ( GPS_DA) Example: 130104 Format: ddmmyy __________________________________________________ GPS Fix Type ( GPS_F) 0= no fix 1= 2D fix 2= 3D fix __________________________________________________ GPS Time ( GPS_UT) Format: hhmmss Example: 222258 __________________________________________________ GPS course over ground (GPS_COG) Course over ground (true) obtained from PGRMF data sentence. Format: Course, degrees true ddd __________________________________________________ GPS Navigation data (GPS) Garmin 17N GPS receiver The datum used by receiver is WGS84. NMEA PGRMF data sentence: Header $PGRMF 1 GPS week number (0 - 1023) 2 GPS seconds (0 - 604799) 3 UTC date of position fix: ddmmyy 4 UTC time of position fix: hhmmss 5 GPS leap second count 6 Latitude: ddmm.mmmm (including leading zeros) 7 Latitude hemisphere, N/S 8 Longitude: ddmm.mmmm (including leading zeros) 9 Longitude, E/W 10 Mode (2d, 3d), M=manual, A=automatic 11 Fix type, 0 = no fix, 1 = 2d fix, 2 = 3d fix 12 Speed Over Ground (SOG), 0 - 1851 kilometers/hour 13 Course Over Ground (COG), 0 - 359 degrees, true 14 Position dilution of precision, 0 - 9 15 Time dilution of precision, 0 - 9 16 checksum NMEA GPVTG data sentence: Header $GPVTG 1 Course, T (degrees true) 2 Course, M (magnetic) 3 Speed, N (knots) 4 Speed, K (km/hr) 5 * checksum . __________________________________________________ GPS speed over ground (GPS_SOG) Speed over ground (km/h) obtained from PGRMF data sentence. Format: Speed Convert to kts with factor 0.54 __________________________________________________ Gyro heading (Gyro) Ship's heading (degrees true) obtained from the Gyro NMEA HEHDT data sentence. Format: Heading (degrees true) __________________________________________________ Knudsen bathymetry ( KND) Knudsen 50 & 200 kHz bathymetry system NMEA output. (Deck box does not have 50 kHz installed) Format: $PKEL99,xx.xx,yy.yy,zzzz*cs $PKEL99 Header xx.xx Depth in meters (200 kHz) yy.yy Depth in meters (50 kHz) zzzz Speed of sound value use for depth determination (m/sec) cs Checksum __________________________________________________ Max Wind Sped ( WIND_Max) meters/second Maximum 5 second wind speed sample over past minute. __________________________________________________ Min Wind Sped ( WIND_Min) meters/second Minimum 5 sec wind speed sample over past minute. __________________________________________________ NMEA Gyro (HEHDT) Ship's heading obtained from Furno GPS receiver array. Format: Header ($HEHDT), Heading (degrees), T (true),* checksum. __________________________________________________ SBE45 MicroTSG ( SBE45) Data format: ttt.tttt, cc.ccccc, sss.ssss, vvvv.vvv t = temperature (degrees Celsius, ITS-90) c = conductivity (S/m) s = salinity (psu) v = sound velocity (meters/second) __________________________________________________ Salinity (Salinity) Format: Salinity Salinity calculated from sea surface temperature and conductivity data values in accordance with UNESCO 44. __________________________________________________ Sea surface conductivity ( SBE45C) Format: cc.ccccc Conductivity S/m Data obtained from Seabird SBE45 MicroTSG __________________________________________________ Sea surface salinity ( SBE45S) Format: sss.ssss Salinity, psu Data obtained from Seabird SBE45 MicroTSG __________________________________________________ Sea surface sound velocity ( SBE45SV) Format: vvvvv.vvv Sound velocity, meters/second Data obtained from Seabird SBE45 MicroTSG __________________________________________________ Sea surface temperature ( SBE45T) Format: ttt.tttt Temperature, degrees Celsius Data obtained from Seabird SBE45 MicroTSG __________________________________________________ Sound velocity ( SSV) Format: Sound_Velocity (meters/sec) Surface sound velocity calculated from sea surface temperature and conductivity data values. Intermediate salinity values are calculated in accordance with UNESCO 44. __________________________________________________ Wind Direction ( WND_DIR) Wind direction (0-359 degrees) corrected for ship's heading and motion. Value is averaged over 5 seconds. __________________________________________________ True Wind Spd & Dir ( TWND_SD) 5 sec average, m/sec, 0-359 degrees Raw data corrected for ship heading, COG & SOG __________________________________________________ Wind Speed ( WND_SPD) Format: WndSpd (meters/sec) corrected for ship's heading and motion. Value is averaged over 5 seconds. __________________________________________________ Turner fluorometer data (TF10_data) Fluorometer data from Turner Designs Model 10. Full scale = 1 volt (1000.00 from MetraByte A/D module). Exact value is not in agreement with instrument front panel meter due to the characteristics of the calibration resistor. Science party is responsible for recording comparative readings during the cruise if needed. __________________________________________________ Turner fluorometer range (TF10_Range) Fluorometer range setting from Turner Designs Model 10 (full scale = 1 volt). Actual values reported by the MetraByte A/D module (1000.00=1 volt) are not in agreement with the value indicated in the Turner manual due to the accuracy of the calibration resistor. Actual readings are per the following table (science party should check these values at some point during the cruise): Range Expected Actual X0 0.0v 000.10 X3.16 0.4v 488.60 X10 0.7v 831.00 X31.6 1.0v 9999.99 __________________________________________________ Wind speed & direction (WND) Format: E.E N.N S.S X.X M.M Wind E (m/sec), Positive for a stbd to port wind Wind N (m/sec), Positive for a bow to stern wind Wind S, (m/sec), Averaged over previous 5 sec. Wind X, (m/sec), max of 5 sec samples for past minute. Wind M (m/sec), min of 5 sec samples for past minute. Calibration - Jul 2003 __________________________________________________ Wind spd & dir (raw data reformated) ( WND_SD) Values are not corrected for vessel heading and motion (see TWND_SD). Speed (m/s), Direction (0-359 degrees) __________________________________________________ __________________________________________________ Defined constants: Mag_Dev = 18.0 WindSensorOffset = 0.0 __________________________________________________ __________________________________________________ Auxiliary information: Timestamp formats: The Calliope data collection application always uses GMT timestamp values regardless of the time zone setting of the application computer. Also, the date used to generate the name of a data file is based on GMT. However, new files are not necessarily started at midnight GMT and any date and time information included in data file headers is local time. If date or time values are included in data files as logged values, these will also be local values. The Calliope ".dat" data file headers indicate the local time zone setting when the file was started. Individual items in Calliope ".dat" data files are time stamped with two different formats. The first timestamp value is in the format used by Microsoft Visual Basic: the number of days since December 31, 1899 (Dec. 31 is day 1, not day 0). Its primary purpose is to provide a continuously increasing date and time indicator for use in data graphing applications. The VB format facilitates this for some applications but converting the number to the normal human readable form can be painful. The second timestamp value (hh:mm:ss format) in combination with the date in the file header may eliminate the need for this conversion. If not, the following may be helpful: 00.00 is 00:00:00 on Dec. 30, 1899. 00.50 is 12:00:00 (noon) on the same day. 35390.58333 is 14:00:00 May 15, 1998.