(1) FILE NAME: 97MMODS2.SLa
     DATA FILE NAME:  97MMODS2.SLb

 (2) YEAR and MONTH: 1997, December

 (3) PI: Mary Ann Moran

 (4) OTHERS: Wade Sheldon, Joe Covert
 
 (5) BRIEF DESCRIPTION OF DATA FILE: ODIS (surface mapper) file that measured
     various environmental parameters every 15 seconds in the Satilla River
     during an LMER5 low tide survey.

 (6) KEYWORDS: Satilla, ODIS, physical, salinity, temperature, density, depth, wind

 (7) RESEARCH LOCATION: Satilla River from -2.9km to 27.5km.

 (8) EXPERIMENTAL DESIGNS and METHODS: The Oceanographic Data Interface System (ODIS)
     was designed to interface with an assortment of instruments that are on a 
     research vessel (see Travis McKissack at the Skidaway Institute of Oceanography
     for technical details).  The intake for this system is located approximately 
     1.5M below the water's surface.  ODIS is currently connected to a Global
     Positioning System (GPS), a fathometer, a SeaBird Electronics thermosalinograph 
     (SBE21), multiple Turner fluorometers, and an external temperature sensor.  

 (9) NOTES and COMMENTS: Missing values appear as NaN (not a number).

(10) VARIABLE DESCRIPTION:
      
     Variable    Variable Description                 Precision/Units   Coded
     --------    --------------------                 ---------------   -----
     DATE        date                                 mm-dd-yyyy        N
     TIME        24 hr GMT                            hh:mm:ss          N
     LAT_DEG     latitude                             deg N             N
     LAT_MIN     latitude                             min N             N
     LONG_DEG    longitude                            deg W             N
     LONG_MIN    longitude                            min W             N
     RIVER       river/waterway name                  2 chars           N
     STATION     distance upriver                     0.001 km          N
     GRNDTRK     ground track direction (true)        deg               N
     GRNDSPD     ground speed (true)                  0.1 km/h          N
     WINDDIR     wind direction (true)                deg               N
     WINDSPD     wind speed (true)                    0.1 m/s           N
     DEPTH       depth                                0.1 m             N
     CONDUCT     conductivity                         0.0001 S/m        N
     SIGMA_T     specific gravity anomaly (sigma-t)   0.001 kg/m^3      N
     TEMP_21     SBE-21 temperature (inside cabin)    0.001 deg C       N
     TEMP_3      SBE-3 temperature (external)         0.001 deg C       N
     SALINITY    salinity                             0.001 PSU         N

(11) CALCULATIONS:  

     RIVER and STATION are output parameters from LMERmapthe GARLMER Project
       mapping and river distance calculation program for Matlab.  

       Note:  Station distances are calculated relative to the line of
       demarcation, and are synchronized to nominal 2km CTD station positions.
       Distance values designated NaN (not a number) indicate locations greater
       than 3km from the main channel of any GARLMER study river (i.e. defined
       as outside the confines of the river)

     SALINITY=PSS-78

     SIGMA_T=p(s,t,O)-1000

       Note:  Both salinity and sigma-t are computed by the SeaBird software program.
       The formulas used wre obtained from "Algorithms for Computation of Fundamental
       Properties of Seawater" by N.P. Fofonoff and R.C. Millard, Jr.; Unesco technical
       papers in marine science #44, 1983.  The station location was interpolated 
       between known stations 2 km apart.

     GRNDTRK and GRNDSPD are corrected for instrument orientation
     
     WINDDIR and WINDSPD are corrected for instrument alignment and boat movement

(12) FOR MORE INFORMATION CONTACT:

        Wade Sheldon
        Dept. of Marine Sciences
        University of Georgia
        Athens, GA  30602-3636
        wade@wiegert.marsci.uga.edu

        Travis McKissack
        Skidaway Inst. of Oceanography
        travis@skio.peachnet.edu  

(13) OTHER DATA FILES TO REFERENCE:

     97MMFLL1.SLb

(14) REFERENCE CITATIONS: None

(15) FORMATION OF VARIABLES:

     FILENAME: 97MMODS2.SLb

     Column #    Column Name     Type       Width   Decimals
     --------    -----------     -------    -----   --------
     1           DATE            date       10
     2           TIME            time       8
     3           LAT_DEG         numeric    2       0
     4           LAT_MIN         numeric    5       2
     5           LONG_DEG        numeric    2       0
     6           LONG_MIN        numeric    5       2
     7           RIVER           text       2
     8           STATION         numeric    7       3
     9           GRNDTRK         numeric    3       0
     10          GRNDSPD         numeric    4       1
     11          WINDDIR         numeric    3       0
     12          WINDSPD         numeric    4       1
     13          DEPTH           numeric    4       1
     14          CONDUCT         numeric    6       4
     15          SIGMA_T         numeric    6       3
     16          TEMP_21         numeric    6       3
     17          TEMP_3          numeric    6       3
     18          SALINITY        numeric    6       3

(16) NUMBER OF RECORDS: 957

(17) STATUS:  1

(18) FOR ARCHIVAL USE:
      Data File Validated By:  Wade Sheldon
      Date:  June 1998
      Date Received By Data Management:  23 June 1998
      Date Entered To Database:  5 August 1998
      Log Of Changes And Comments:
        1. August 1998 - minor editorial changes - tdb