undef

s1a-ew-grd-hh-20151014t162837-20151014t162941-008151-00b71e-001_filter

s1a-ew-grd-hv-20151014t162837-20151014t162941-008151-00b71e-002_filter

s1a-ew-grd-hh-20151014t162837-20151014t162941-008151-00b71e-001_winddir

s1a-ew-grd-hv-20151014t162837-20151014t162941-008151-00b71e-002_winddir