undef

s1b-iw-grd-vh-20171015t184420-20171015t184445-007844-00dd96-002_filter

s1b-iw-grd-vv-20171015t184420-20171015t184445-007844-00dd96-001_filter

s1b-iw-grd-vv-20171015t184420-20171015t184445-007844-00dd96-001_winddir

s1b-iw-grd-vh-20171015t184420-20171015t184445-007844-00dd96-002_winddir