undef

s1a-ew-grd-hv-20160615t163644-20160615t163745-011724-011f97-002_filter

s1a-ew-grd-hh-20160615t163644-20160615t163745-011724-011f97-001_filter

s1a-ew-grd-hv-20160615t163644-20160615t163745-011724-011f97-002_winddir

s1a-ew-grd-hh-20160615t163644-20160615t163745-011724-011f97-001_winddir