undef

s1a-ew-grd-hh-20150708t150549-20150708t150649-006721-008ff4-001_filter

s1a-ew-grd-hv-20150708t150549-20150708t150649-006721-008ff4-002_filter

s1a-ew-grd-hh-20150708t150549-20150708t150649-006721-008ff4-001_winddir

s1a-ew-grd-hv-20150708t150549-20150708t150649-006721-008ff4-002_winddir