undef

s1a-ew-grd-hh-20160124t154339-20160124t154439-009638-00e0b4-001_filter

s1a-ew-grd-hv-20160124t154339-20160124t154439-009638-00e0b4-002_filter

s1a-ew-grd-hv-20160124t154339-20160124t154439-009638-00e0b4-002_winddir

s1a-ew-grd-hh-20160124t154339-20160124t154439-009638-00e0b4-001_winddir