undef

s1a-iw-grd-vh-20170607t063010-20170607t063035-016924-01c297-002_filter

s1a-iw-grd-vv-20170607t063010-20170607t063035-016924-01c297-001_filter

s1a-iw-grd-vh-20170607t063010-20170607t063035-016924-01c297-002_winddir

s1a-iw-grd-vv-20170607t063010-20170607t063035-016924-01c297-001_winddir