undef

s1a-ew-grd-hv-20151030t173358-20151030t173458-008385-00bd79-002_filter

s1a-ew-grd-hh-20151030t173358-20151030t173458-008385-00bd79-001_filter

s1a-ew-grd-hh-20151030t173358-20151030t173458-008385-00bd79-001_winddir

s1a-ew-grd-hv-20151030t173358-20151030t173458-008385-00bd79-002_winddir