undef

s1a-ew-grd-hh-20151018t105959-20151018t110059-008206-00b8b3-001_filter

s1a-ew-grd-hv-20151018t105959-20151018t110059-008206-00b8b3-002_filter

s1a-ew-grd-hv-20151018t105959-20151018t110059-008206-00b8b3-002_winddir

s1a-ew-grd-hh-20151018t105959-20151018t110059-008206-00b8b3-001_winddir