undef

s1b-ew-grd-hh-20170114t152637-20170114t152710-003846-0069e0-001_filter

s1b-ew-grd-hv-20170114t152637-20170114t152710-003846-0069e0-002_filter

s1b-ew-grd-hv-20170114t152637-20170114t152710-003846-0069e0-002_winddir

s1b-ew-grd-hh-20170114t152637-20170114t152710-003846-0069e0-001_winddir