undef

s1a-ew-grd-hv-20160722t153846-20160722t153946-012263-0130e5-002_filter

s1a-ew-grd-hh-20160722t153846-20160722t153946-012263-0130e5-001_filter

s1a-ew-grd-hh-20160722t153846-20160722t153946-012263-0130e5-001_winddir

s1a-ew-grd-hv-20160722t153846-20160722t153946-012263-0130e5-002_winddir