% ATOVS_DEFINE_AMSUBL1C   Define a format of AMSU-B level 1c data record
%
% This function defines a format of AMSU-B level 1c data record.
%
% FORMAT   [rec_format, rec_len, nchan, nfovs] = atovs_define_amsubl1c;
%
% OUT   rec_format   Format of a record. A structure with fields:
%                    time, lat, lon, lza, laa, sza, saa, and tb.
%       rec_len      Length of a record.
%       nchan        Number of channels.
%       nfovs        Number of instrument field of views.

% 2004-06-29   Created by Mashrab Kuvatov.
% 2010-11-11   Adapted by Gerrit Holl (also return angles).

function [rec_format, rec_len, nchan, nfovs] = atovs_define_amsubl1c

% number of channels
nchan = 5;

% number of instrument field of views
nfovs = 90;

% length of a record
rec_len = 1152;

% define where each of these appear in the data records
rec_format.time     = 4;
rec_format.lat = 13 + 2 * (1:nfovs);
rec_format.lon = 14 + 2 * (1:nfovs);

% NWPSAP-MF-UD-003_Formats.pdf page 106, field amb1c_angles

rec_format.lza = 195 + 4 * (0:(nfovs-1));
rec_format.laa = 196 + 4 * (0:(nfovs-1));
rec_format.sza = 197 + 4 * (0:(nfovs-1));
rec_format.saa = 198 + 4 * (0:(nfovs-1));

for ichan = 1 : nchan
  rec_format.tb( ichan, : ) = 552 + ichan + nchan * (1:nfovs);
end

return
end