undef

s1a-ew-grd-hv-20150709t172521-20150709t172621-006737-00906b-002_filter

s1a-ew-grd-hh-20150709t172521-20150709t172621-006737-00906b-001_filter

s1a-ew-grd-hv-20150709t172521-20150709t172621-006737-00906b-002_winddir

s1a-ew-grd-hh-20150709t172521-20150709t172621-006737-00906b-001_winddir