undef

s1a-iw-grd-vv-20180814t100130-20180814t100155-023241-0286b5-001_filter

s1a-iw-grd-vh-20180814t100130-20180814t100155-023241-0286b5-002_filter

s1a-iw-grd-vv-20180814t100130-20180814t100155-023241-0286b5-001_winddir

s1a-iw-grd-vh-20180814t100130-20180814t100155-023241-0286b5-002_winddir