undef

s1a-ew-grd-hh-20151016t174946-20151016t175046-008181-00b7f7-001_filter

s1a-ew-grd-hv-20151016t174946-20151016t175046-008181-00b7f7-002_filter

s1a-ew-grd-hv-20151016t174946-20151016t175046-008181-00b7f7-002_winddir

s1a-ew-grd-hh-20151016t174946-20151016t175046-008181-00b7f7-001_winddir