undef

s1b-ew-grd-hv-20170719t161115-20170719t161219-006559-00b888-002_filter

s1b-ew-grd-hh-20170719t161115-20170719t161219-006559-00b888-001_filter

s1b-ew-grd-hh-20170719t161115-20170719t161219-006559-00b888-001_winddir

s1b-ew-grd-hv-20170719t161115-20170719t161219-006559-00b888-002_winddir