undef

s1b-ew-grd-hv-20170602t115650-20170602t115750-005871-00a4b7-002_filter

s1b-ew-grd-hh-20170602t115650-20170602t115750-005871-00a4b7-001_filter

s1b-ew-grd-hv-20170602t115650-20170602t115750-005871-00a4b7-002_winddir

s1b-ew-grd-hh-20170602t115650-20170602t115750-005871-00a4b7-001_winddir