Archived CODAR Data File Format

CODAR Remote Site Locations

** Negative longitude indicated degrees west and positive latitude indicates 
   degrees north.

Northern Site 
    longitude : -74.1983 degrees
    latitude  :  39.6153 degrees

Southern Site
    longitude : -74.3575 degrees
    latitude  :  39.4113 degrees

Origin Point (midpoint of baseline drawn between the two sites)
    longitude : -74.2779 degrees
    latitude  :  39.5133 degrees


Filenames are of the form Tot_MRSL_yy-mm-dd-hhmm.tot for 1998 data.
Filenames are of the form Tot_COOL_yy_mm_dd_hhmm.tot for 1999 and 2000 data.


where:

yy=year    (i.e. 98 for 1998).
mm=month   (i.e. 07 for July).
dd=day     (i.e. 01 for the 1st).
hh-hour    (i.e. 23 for 11:00 pm GMT).
mm=minute  (i.e. 00 for zero minutes).

Each ASCII file contains 22 columns of data.  Each row corresponds to a grid 
point in the surface current vector field.  (999 indicates data dropouts)

**The distance referred to in the following descriptions is that measured
   from the origin point (defined above) to a particular grid point.

Col 01 : True east component of the distance. (km) 

Col 02 : True north component of the distance. (km)  

Col 03 : Longitude of the grid point. (degrees, negative for west)

Col 04 : Latitude of the grid point. (degrees)

Col 05 : Perpendicular component (with respect to the baseline) of the 
         distance. (km)

Col 06 : Parallel component (with respect to the baseline) of the 
         distance. (km)

Col 07 : Magnitude of the distance (km)

** The vector field can be looked at as a rotated two dimensional matrix (i,j)
   with the x and y axes perpendicular and  parallel to the baseline, 
   respectively.  The matrix has an elemental spacing of 1.5 km and the 
   origin (0,0) is the origin point previously defined. (x-direction positive
   offshore mnd y direction positive alongshore to the northeast)

Col 08 : The i-th row of the vector field matrix. (x-direction)
         
Col 09 : The j-th column of the vector field matrix. (y-direction)
 
** All of the following velocity components are based on true east and north 
   directions.

Col 10 : East Component of the raw velocity field, positive to the 
         east. (cm/s) 

Col 11 : North Component of the raw velocity field, positive to the 
         north. (cm/s)

Col 12 : East Component of the tidal velocity field, positive to the 
         east. (cm/s)

Col 13 : North Component of the tidal velocity field, positive to the 
         north. (cm/s)

Col 14 : East Component of the detided velocity field, positive to the 
         east. (cm/s)

Col 15 : North Component of the detided velocity field, positive to the 
         north. (cm/s)

Col 16 : East Component of the lowpass filtered velocity field, positive to 
         the east. (cm/s)

Col 17 : North Component of the lowpass filtered velocity field, positive to 
         the north. (cm/s)

Col 18 : East Component of the high-pass velocity field, positive to the 
         east. (cm/s)

Col 19 : North Component of the high-pass velocity field, positive to the 
         north. (cm/s)

Col 20 : Surface divergence as indicated by vertical velocity (assuming a 
         1 meter thick surface layer), positive is upwelled water. (m/day)

Col 21 : Surface vorticity normalized with local planetary vorticity (f). 

Col 22 : Time. (year day) (day 001.5000 = January 1st 12:00 pm GMT)

** A description of how each of the velocity fields were calculated can be
   viewed using the image_info link on the archived data web page.