undef

s1a-iw-grd-vh-20160816t175021-20160816t175046-012629-013cff-002_filter

s1a-iw-grd-vv-20160816t175021-20160816t175046-012629-013cff-001_filter

s1a-iw-grd-vv-20160816t175021-20160816t175046-012629-013cff-001_winddir

s1a-iw-grd-vh-20160816t175021-20160816t175046-012629-013cff-002_winddir