undef

s1a-ew-grd-vv-20160905t103309-20160905t103409-012916-0146b3-001_filter

s1a-ew-grd-vh-20160905t103309-20160905t103409-012916-0146b3-002_filter

s1a-ew-grd-vh-20160905t103309-20160905t103409-012916-0146b3-002_winddir

s1a-ew-grd-vv-20160905t103309-20160905t103409-012916-0146b3-001_winddir