(1)  FILE NAME: 99MMODS3.SLa
     DATA FILE NAME: 99MMODS3.SLb

(2)  YEAR and MONTH: 1999, March

(3)  PI: Mary Ann Moran

(4)  Others: Wade M. Sheldon, Jr.

(5)  BRIEF DESCRIPTION OF DATA FILE: ODIS (surface mapper) file that measured various
     environmental parameters every 30 seconds in the Satilla River during a low tide survey.

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

(7)  RESEARCH LOCATION: Satilla River from -0.6km to 32.6km

(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-Design fluorometers,
     and an external temperature sensor.

(9)  NOTES and COMMENTS: Missing and invalid values appear as NaN (not a number).
     The DOM fluorometer was offline during part of this survey.

(10) VARIABLE DESCRIPTION:

     Variable  Variable Description                Precision/Units Coded
     --------  --------------------                --------------- -----
     DATE      date                                mmddyyyy        N
     TIME      24 hr GMT                           hhmmss          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
     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
     NEPHELS   relative turbidity                  0.001 nephels   N
     FLUOR_CHL relative chlorophyll fluorescence   0.001 fluors    N
     FLUOR_DOM DOM fluorescence (uncorrected)      0.01 qse(ppb)   N

(11) CALCULATIONS:

     STATION data were calculated from GPS positions using LMERmap ver. 3.02 (the 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.

     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 M. Sheldon, Jr.
     Dept. of Marine Sciences
     University of Georgia
     Athens, GA  30602-3636
     sheldon@arches.uga.edu

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

(13) OTHER DATA FILES TO REFERENCE:

     99MMFL3.SLb

(14) REFERENCE CITATIONS: None

(15) FORMAT OF VARIABLES:

     FILENAME:  99MMODS3.SLb

     Column #  Column Name   Type       Width      Decimals
     --------  -----------   ----       -----      --------
     1         DATE          date       8
     2         TIME          time       6
     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         STATION       numeric    6          3
     8         GRNDTRK       numeric    3          0
     9         GRNDSPD       numeric    4          1
     10        WINDDIR       numeric    3          0
     11        WINDSPD       numeric    4          1
     12        DEPTH         numeric    4          1
     13        CONDUCT       numeric    6          4
     14        SIGMA_T       numeric    6          3
     15        TEMP_21       numeric    6          3
     16        TEMP_3        numeric    6          3
     17        SALINITY      numeric    6          3
     18        NEPHELS       numeric    5          3
     19        FLUOR_CHL     numeric    5          3
     20        FLUOR_DOM     numeric    6          2

(16) NUMBER OF RECORDS: 486

(17) STATUS:  2

(18) FOR ARCHIVAL USE:
      Data File Validated By:  Wade Sheldon
      Date:  February 2000
      Date Received By Data Management:  14 February 2000
      Date Entered To Database:  14 February 2000
      Log Of Changes And Comments: