undef

s1a-iw-grd-vh-20180724t205148-20180724t205213-022941-027d45-002_filter

s1a-iw-grd-vv-20180724t205148-20180724t205213-022941-027d45-001_filter

s1a-iw-grd-vh-20180724t205148-20180724t205213-022941-027d45-002_winddir

s1a-iw-grd-vv-20180724t205148-20180724t205213-022941-027d45-001_winddir