undef
s1a-iw-grd-vh-20160722t160014-20160722t160042-012263-0130e8-002_filter
s1a-iw-grd-vv-20160722t160014-20160722t160042-012263-0130e8-001_filter
s1a-iw-grd-vh-20160722t160014-20160722t160042-012263-0130e8-002_winddir
s1a-iw-grd-vv-20160722t160014-20160722t160042-012263-0130e8-001_winddir