undef

s1a-iw-grd-vh-20160719t100054-20160719t100119-012216-012f6c-002_filter

s1a-iw-grd-vv-20160719t100054-20160719t100119-012216-012f6c-001_filter

s1a-iw-grd-vh-20160719t100054-20160719t100119-012216-012f6c-002_winddir

s1a-iw-grd-vv-20160719t100054-20160719t100119-012216-012f6c-001_winddir