undef

s1a-ew-grd-hh-20150707t142538-20150707t142638-006706-008f8d-001_filter

s1a-ew-grd-hv-20150707t142538-20150707t142638-006706-008f8d-002_filter

s1a-ew-grd-hh-20150707t142538-20150707t142638-006706-008f8d-001_winddir

s1a-ew-grd-hv-20150707t142538-20150707t142638-006706-008f8d-002_winddir