undef

s1a-ew-grd-hh-20151124t145757-20151124t145857-008748-00c75e-001_filter

s1a-ew-grd-hv-20151124t145757-20151124t145857-008748-00c75e-002_filter

s1a-ew-grd-hh-20151124t145757-20151124t145857-008748-00c75e-001_winddir

s1a-ew-grd-hv-20151124t145757-20151124t145857-008748-00c75e-002_winddir