undef

s1a-iw-grd-vv-20171106t112740-20171106t112805-019144-020652-001_filter

s1a-iw-grd-vh-20171106t112740-20171106t112805-019144-020652-002_filter

s1a-iw-grd-vh-20171106t112740-20171106t112805-019144-020652-002_winddir

s1a-iw-grd-vv-20171106t112740-20171106t112805-019144-020652-001_winddir