undef

s1a-ew-grd-vh-20160831t031624-20160831t031712-012839-014425-002_filter

s1a-ew-grd-vv-20160831t031624-20160831t031712-012839-014425-001_filter

s1a-ew-grd-vh-20160831t031624-20160831t031712-012839-014425-002_winddir

s1a-ew-grd-vv-20160831t031624-20160831t031712-012839-014425-001_winddir