undef

s1a-iw-grd-vh-20160309t100019-20160309t100048-010291-00f392-002_filter

s1a-iw-grd-vv-20160309t100019-20160309t100048-010291-00f392-001_filter

s1a-iw-grd-vv-20160309t100019-20160309t100048-010291-00f392-001_winddir

s1a-iw-grd-vh-20160309t100019-20160309t100048-010291-00f392-002_winddir