undef

s1a-ew-grd-hv-20151013t154717-20151013t154817-008136-00b6b6-002_filter

s1a-ew-grd-hh-20151013t154717-20151013t154817-008136-00b6b6-001_filter

s1a-ew-grd-hh-20151013t154717-20151013t154817-008136-00b6b6-001_winddir

s1a-ew-grd-hv-20151013t154717-20151013t154817-008136-00b6b6-002_winddir