undef

s1a-iw-grd-vv-20161103t063009-20161103t063034-013774-0161f4-001_filter

s1a-iw-grd-vh-20161103t063009-20161103t063034-013774-0161f4-002_filter

s1a-iw-grd-vh-20161103t063009-20161103t063034-013774-0161f4-002_winddir

s1a-iw-grd-vv-20161103t063009-20161103t063034-013774-0161f4-001_winddir