undef

s1a-ew-grd-hh-20150928t134433-20150928t134533-007916-00b0dd-001_filter

s1a-ew-grd-hv-20150928t134433-20150928t134533-007916-00b0dd-002_filter

s1a-ew-grd-hh-20150928t134433-20150928t134533-007916-00b0dd-001_winddir

s1a-ew-grd-hv-20150928t134433-20150928t134533-007916-00b0dd-002_winddir