undef

s1a-ew-grd-hv-20150927t130330-20150927t130430-007901-00b075-002_filter

s1a-ew-grd-hh-20150927t130330-20150927t130430-007901-00b075-001_filter

s1a-ew-grd-hv-20150927t130330-20150927t130430-007901-00b075-002_winddir

s1a-ew-grd-hh-20150927t130330-20150927t130430-007901-00b075-001_winddir