undef

s1a-ew-grd-hh-20151008t140059-20151008t140159-008062-00b4b2-001_filter

s1a-ew-grd-hv-20151008t140059-20151008t140159-008062-00b4b2-002_filter

s1a-ew-grd-hh-20151008t140059-20151008t140159-008062-00b4b2-001_winddir

s1a-ew-grd-hv-20151008t140059-20151008t140159-008062-00b4b2-002_winddir