undef

s1a-iw-grd-vh-20170819t100124-20170819t100149-017991-01e319-002_filter

s1a-iw-grd-vv-20170819t100124-20170819t100149-017991-01e319-001_filter

s1a-iw-grd-vh-20170819t100124-20170819t100149-017991-01e319-002_winddir

s1a-iw-grd-vv-20170819t100124-20170819t100149-017991-01e319-001_winddir