undef

s1a-ew-grd-hh-20160722t072622-20160722t072726-012258-0130c2-001_filter

s1a-ew-grd-hv-20160722t072622-20160722t072726-012258-0130c2-002_filter

s1a-ew-grd-hv-20160722t072622-20160722t072726-012258-0130c2-002_winddir

s1a-ew-grd-hh-20160722t072622-20160722t072726-012258-0130c2-001_winddir