undef

s1b-ew-grd-vv-20180927t012804-20180927t012904-012894-017cfc-001_filter

s1b-ew-grd-vh-20180927t012804-20180927t012904-012894-017cfc-002_filter

s1b-ew-grd-vh-20180927t012804-20180927t012904-012894-017cfc-002_winddir

s1b-ew-grd-vv-20180927t012804-20180927t012904-012894-017cfc-001_winddir