undef

s1a-ew-grd-hh-20151024t132804-20151024t132904-008295-00bb19-001_filter

s1a-ew-grd-hv-20151024t132804-20151024t132904-008295-00bb19-002_filter

s1a-ew-grd-hv-20151024t132804-20151024t132904-008295-00bb19-002_winddir

s1a-ew-grd-hh-20151024t132804-20151024t132904-008295-00bb19-001_winddir