undef

s1a-ew-grd-hh-20150723t153055-20150723t153155-006940-009643-001_filter

s1a-ew-grd-hv-20150723t153055-20150723t153155-006940-009643-002_filter

s1a-ew-grd-hv-20150723t153055-20150723t153155-006940-009643-002_winddir

s1a-ew-grd-hh-20150723t153055-20150723t153155-006940-009643-001_winddir