pfe:~dmenemen/llc_2160/regions/latlon/readme.txt

Files in latlon/grid are the MITgcm grid specification files.
In particular (XC,YC) are the longitude/latitude coordinates
of the grid cell centers and (XG,YG) are the coordiates
of the southwest corners of the grid cells.
They are Binary, IEEE-big-endian Real*4, 8640x4320
XC=readbin('grid/XC_8640x4320',[8640 4320]);

Files in latlon/Salt are sea surface salinity in g/kg
specified at the grid cell centers (XC,YC):
TIMESTEP_Salt_1.1441.1_8640.4320.1
TIMESTEP=92160:80:1586400;       % are the available time steps
ts2dte(TIMESTEP,45,2011,1,17,30) % converts TIMESTEP to a date
Salt=readbin('Salt/0000092160_Salt_1.1441.1_8640.4320.1',[8640 4320]);

Files in latlon/Theta are sea surface temperature in deg C
specified at the grid cell centers (XC,YC):
TIMESTEP_Theta_1.1441.1_8640.4320.1
TIMESTEP=92160:80:1586400;       % are the available time steps
ts2dte(TIMESTEP,45,2011,1,17,30) % converts TIMESTEP to a date
Theta=readbin('Theta/0000092160_Theta_1.1441.1_8640.4320.1',[8640 4320]);

Files latlon/U and V are the surface velocity fields at southwest
edges of the grid cells.

Files in latlon/matlab

readbin.m and ts2dte.m are matlab routines used to read files as per above.

ExtractFields.m   Used to extract grid information and surface S/T/U/V
                  for the 70S-57N geographical region, which is
                  on a latitude/longitude grid.

plot_currents.m   Used to simulated plot surface currents near Cameroon.

get_coastline.m   Find all wet points adjacent to at least one dry point.
                  Saved to latlon/grid/coastline.mat

lookat.m          Plots U and V fields.

drifters.m        Generates drifter trajectories for 11 release locations
                  for Magdalene's paper.
                  Saved in latlon/drift/magdalene/magdalene.mat

drifters_v2.m     Computes and saves global trajectories in
                  latlon/drift/global
   output file format:
        DriftLat_n4331_dt3600_DATE
        DriftLon_n4331_dt3600_DATE
        where DATE ranges from 20110401T000000 to 20120401T000000
        One file per release hour
        Binary, IEEE-big-endian Real*4
        4331 drifters by 8761 hourly time steps
        driftlat=readbin('global/DriftLat_n4331_dt3600_20120401T000000',[4331 8761]);
        driftlon=readbin('global/DriftLon_n4331_dt3600_20120401T000000',[4331 8761]);
        plot(driftlon(:),driftlat(:),'.')

drifters_v3.m     Computes and saves global trajectories in
                  latlon/drift/global_v3
   output file format:
        DriftLat_4331xACTIVE_DATE
        DriftLon_4331xACTIVE_DATE
        Where DATE ranges from 20110401T000000 to 20130401T000000
        and ACTIVE ranges from 1 to 8761 and back to 1
        One file per integration hour
        Binary, IEEE-big-endian Real*4
        4331 drifters by ACTIVE floats
        driftlat=readbin('global_v3/DriftLat_4331x8529_20120321T080000',[4331 8529]);
        driftlon=readbin('global_v3/DriftLon_4331x8529_20120321T080000',[4331 8529]);
        plot(driftlon(:),driftlat(:),'.')

get_TS.m          Extract Theta and Salt for v3 DriftLat and DriftLon
   output file format same as v3 above:
        DriftS_4331xACTIVE_DATE
        DriftT_4331xACTIVE_DATE
        Where DATE ranges from 20110401T000000 to 20130401T000000
        and ACTIVE ranges from 1 to 8761 and back to 1