undef

s1a-ew-grd-hv-20150913t114141-20150913t114241-007696-00aaf3-002_filter

s1a-ew-grd-hh-20150913t114141-20150913t114241-007696-00aaf3-001_filter

s1a-ew-grd-hh-20150913t114141-20150913t114241-007696-00aaf3-001_winddir

s1a-ew-grd-hv-20150913t114141-20150913t114241-007696-00aaf3-002_winddir