undef

s1b-iw-grd-vv-20180221t204439-20180221t204506-009726-0118f3-001_filter

s1b-iw-grd-vh-20180221t204439-20180221t204506-009726-0118f3-002_filter

s1b-iw-grd-vh-20180221t204439-20180221t204506-009726-0118f3-002_winddir

s1b-iw-grd-vv-20180221t204439-20180221t204506-009726-0118f3-001_winddir