undef

s1b-iw-grd-hv-20160929t173340-20160929t173404-002287-003dc0-002_filter

s1b-iw-grd-hh-20160929t173340-20160929t173404-002287-003dc0-001_filter

s1b-iw-grd-hv-20160929t173340-20160929t173404-002287-003dc0-002_winddir

s1b-iw-grd-hh-20160929t173340-20160929t173404-002287-003dc0-001_winddir