undef

s1a-iw-grd-vh-20170910t232751-20170910t232816-018320-01ed26-002_filter

s1a-iw-grd-vv-20170910t232751-20170910t232816-018320-01ed26-001_filter

s1a-iw-grd-vh-20170910t232751-20170910t232816-018320-01ed26-002_winddir

s1a-iw-grd-vv-20170910t232751-20170910t232816-018320-01ed26-001_winddir