%Eddy database is a structure where each index is a different eddy and the field
%names describe different eddy parameters
%
%Structure name: eddy (there are 76 different eddies)
%
%Field names:    .id (cell array containing eddy index numbers in
%                    chronological order according to when an eddy passes over ALOHA, also
%                    denoted with a (C) for cyclonic and (A) for anticyclonic, 
%                    followed by the eddy number assigned from algorithm output, determined from
%                    chron_eddy.m
%
%                .output (gridded output from Chelton algorithm where the
%                        columns are track number, date, longitude, latitude, amplitude, effective
%                        radius, e-folding scale, closed radius, index, axial speed, translation
%                        speed) descriptions of these parameters are found in the read_eddy_out.m
%                        file
%
%                .HOT 
%                    .variables (matrix containing cruise averaged vertical profiles
%                               of salinity, potential vorticity, [nitrate + nitrite], silicate, phosphate 
%                               (if available) and dissolved oxygen on potential density surfaces, more on
%                               these variables is found in HOT_data_extract.m
%                    .cruises (tells which cruise(s) data is included for
%                              each eddy), an eddy cruise occurs when some
%                              part of the eddy is overlapping Station
%                              ALOHA 
%                    .sampled_region (string that dictates which part of
%                                    the eddy was sampled during each HOT
%                                    cruise, recorded in appendixA.xls
%
%                .ADCP (vertical profile of onstation averaged current
%                      profile that matches with cruise(s) in .HOT.cruises, more info on ADCP processing
%                      found in adcp_mean_prof_plt.m.  The first column are
%                      U vectors and the second are V vectors.  The 25
%                      levels in the vertical are [20:20:500] decibars
%
%                .impact (list of times and eddy height at ALOHA when the
%                        eddy radius is overlapping the 10 km circle surrounding Station ALOHA.
%                        Eddy height assumes the eddy has a gaussian shape,
%                        calculated in chron_eddy.m
%
%                .CPA 
%                    .time_dis (closest point of approach of the eddy to ALOHA,
%                              contains the time and distance of when it
%                              occurs) determined from chron_eddy.m
%                    .eddy_section (string describing the part of the eddy
%                                  over ALOHA at time of CPA) recorded in
%                                  appendixA.xls
%
%                .notes 
%                      .sat_cvrg (satellite coverage (names) during tracking)
%                                 T/P is Topex/Poseidon, ENVT is Envisat,
%                                 ERS-1 and ERS-2 and JSN1 is Jason-1,
%                                 recorded in appendixA.xls
%                      .description (cell array containing results from visual analysis
%                                   which discusses changes in translation direction, eddy-eddy and eddy-
%                                   topography interactions) recorded in
%                                   appendixA.xls