websave downloaded file different than manually downloaded

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Liang kuang
Liang kuang on 19 Oct 2016
Edited: Walter Roberson on 19 Oct 2016
I'm trying to download some *.nc files direct from some url using websave. It can successfully download the files but the file size is different than the file I manually downloaded from the browser. Here is the file source: http://opendap.co-ops.nos.noaa.gov/index.php?dir=/netcdf/nyofs/201603/ The nc file with size of 1 MB shows only 25 KB with Matlab download.
starting_date = datenum('2016-03-01');
end_date = datenum('2016-03-02');
for n =1: end_date-starting_date
current_date_download = starting_date + n -1;
for t = 0 : 23
posext = ['.t',sprintf('%02s',num2str(t)),'z.nc'];
filename = ['nos.nyofs_fg.stations.nowcast.',datestr(current_date_download,'yyyymmdd'),posext];
sprintf('processing %s - %02d z download\n',datestr(current_date_download),t)
url = ['http://opendap.co-ops.nos.noaa.gov/netcdf/nyofs/',datestr(current_date_download,'yyyymm'), ...
sprintf('Downloading %s , please waiting ...\n', url)
options = weboptions('RequestMethod','post');
outfilename = websave(filename, url,options);
warning('file does not exsit, check url');
sprintf('Job successfully finished for downloading nc files!!')

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