undef

s1a-ew-grd-hh-20160531t125455-20160531t125555-011503-0118a9-001_filter

s1a-ew-grd-hv-20160531t125455-20160531t125555-011503-0118a9-002_filter

s1a-ew-grd-hh-20160531t125455-20160531t125555-011503-0118a9-001_winddir

s1a-ew-grd-hv-20160531t125455-20160531t125555-011503-0118a9-002_winddir