undef

s1a-iw-grd-vh-20151010t100901-20151010t100930-008089-00b56d-002_filter

s1a-iw-grd-vv-20151010t100901-20151010t100930-008089-00b56d-001_filter

s1a-iw-grd-vv-20151010t100901-20151010t100930-008089-00b56d-001_winddir

s1a-iw-grd-vh-20151010t100901-20151010t100930-008089-00b56d-002_winddir