undef

s1b-ew-grd-hh-20170615t141703-20170615t141807-006062-00aa52-001_filter

s1b-ew-grd-hv-20170615t141703-20170615t141807-006062-00aa52-002_filter

s1b-ew-grd-hv-20170615t141703-20170615t141807-006062-00aa52-002_winddir

s1b-ew-grd-hh-20170615t141703-20170615t141807-006062-00aa52-001_winddir