undef

s1b-ew-grd-hh-20170726t075026-20170726t075131-006656-00bb52-001_filter

s1b-ew-grd-hv-20170726t075026-20170726t075131-006656-00bb52-002_filter

s1b-ew-grd-hh-20170726t075026-20170726t075131-006656-00bb52-001_winddir

s1b-ew-grd-hv-20170726t075026-20170726t075131-006656-00bb52-002_winddir