undef

s1a-ew-grd-hh-20150908t131140-20150908t131240-007624-00a8fc-001_filter

s1a-ew-grd-hv-20150908t131140-20150908t131240-007624-00a8fc-002_filter

s1a-ew-grd-hh-20150908t131140-20150908t131240-007624-00a8fc-001_winddir

s1a-ew-grd-hv-20150908t131140-20150908t131240-007624-00a8fc-002_winddir