undef

s1b-ew-grd-vv-20180912t081831-20180912t081936-012679-01765a-001_filter

s1b-ew-grd-vh-20180912t081831-20180912t081936-012679-01765a-002_filter

s1b-ew-grd-vv-20180912t081831-20180912t081936-012679-01765a-001_winddir

s1b-ew-grd-vh-20180912t081831-20180912t081936-012679-01765a-002_winddir