undef

s1a-ew-grd-hv-20160727t172514-20160727t172614-012337-01335a-002_filter

s1a-ew-grd-hh-20160727t172514-20160727t172614-012337-01335a-001_filter

s1a-ew-grd-hv-20160727t172514-20160727t172614-012337-01335a-002_winddir

s1a-ew-grd-hh-20160727t172514-20160727t172614-012337-01335a-001_winddir