undef

s1a-ew-grd-hh-20151022t120503-20151022t120603-008265-00ba4f-001_filter

s1a-ew-grd-hv-20151022t120503-20151022t120603-008265-00ba4f-002_filter

s1a-ew-grd-hv-20151022t120503-20151022t120603-008265-00ba4f-002_winddir

s1a-ew-grd-hh-20151022t120503-20151022t120603-008265-00ba4f-001_winddir