undef

s1a-ew-grd-hh-20160720t173328-20160720t173428-012235-013005-001_filter

s1a-ew-grd-hv-20160720t173328-20160720t173428-012235-013005-002_filter

s1a-ew-grd-hv-20160720t173328-20160720t173428-012235-013005-002_winddir

s1a-ew-grd-hh-20160720t173328-20160720t173428-012235-013005-001_winddir