undef

s1a-ew-grd-hh-20150622t172122-20150622t172226-006489-0089b4-001_filter

s1a-ew-grd-hv-20150622t172122-20150622t172226-006489-0089b4-002_filter

s1a-ew-grd-hh-20150622t172122-20150622t172226-006489-0089b4-001_winddir

s1a-ew-grd-hv-20150622t172122-20150622t172226-006489-0089b4-002_winddir