undef

s1a-ew-grd-hh-20151031t114041-20151031t114141-008396-00bdbd-001_filter

s1a-ew-grd-hv-20151031t114041-20151031t114141-008396-00bdbd-002_filter

s1a-ew-grd-hh-20151031t114041-20151031t114141-008396-00bdbd-001_winddir

s1a-ew-grd-hv-20151031t114041-20151031t114141-008396-00bdbd-002_winddir