undef

s1a-ew-grd-hv-20150918t132804-20150918t132904-007770-00acda-002_filter

s1a-ew-grd-hh-20150918t132804-20150918t132904-007770-00acda-001_filter

s1a-ew-grd-hh-20150918t132804-20150918t132904-007770-00acda-001_winddir

s1a-ew-grd-hv-20150918t132804-20150918t132904-007770-00acda-002_winddir