undef

s1b-ew-grd-hh-20170718t170835-20170718t170939-006545-00b823-001_filter

s1b-ew-grd-hv-20170718t170835-20170718t170939-006545-00b823-002_filter

s1b-ew-grd-hh-20170718t170835-20170718t170939-006545-00b823-001_winddir

s1b-ew-grd-hv-20170718t170835-20170718t170939-006545-00b823-002_winddir