undef

s1a-ew-grd-vh-20171014t075002-20171014t075102-018806-01fbf4-002_filter

s1a-ew-grd-vv-20171014t075002-20171014t075102-018806-01fbf4-001_filter

s1a-ew-grd-vv-20171014t075002-20171014t075102-018806-01fbf4-001_winddir

s1a-ew-grd-vh-20171014t075002-20171014t075102-018806-01fbf4-002_winddir