undef

s1a-iw-grd-vh-20150928t100930-20150928t100955-007914-00b0ca-002_filter

s1a-iw-grd-vv-20150928t100930-20150928t100955-007914-00b0ca-001_filter

s1a-iw-grd-vh-20150928t100930-20150928t100955-007914-00b0ca-002_winddir

s1a-iw-grd-vv-20150928t100930-20150928t100955-007914-00b0ca-001_winddir