undef

s1a-ew-grd-hv-20151018t173340-20151018t173440-008210-00b8ce-002_filter

s1a-ew-grd-hh-20151018t173340-20151018t173440-008210-00b8ce-001_filter

s1a-ew-grd-hh-20151018t173340-20151018t173440-008210-00b8ce-001_winddir

s1a-ew-grd-hv-20151018t173340-20151018t173440-008210-00b8ce-002_winddir