undef

s1b-iw-grd-hv-20160929t173234-20160929t173309-002287-003dbf-002_filter

s1b-iw-grd-hh-20160929t173234-20160929t173309-002287-003dbf-001_filter

s1b-iw-grd-hv-20160929t173234-20160929t173309-002287-003dbf-002_winddir

s1b-iw-grd-hh-20160929t173234-20160929t173309-002287-003dbf-001_winddir