undef

s1b-iw-grd-hv-20160829t063212-20160829t063231-001828-002c63-002_filter

s1b-iw-grd-hh-20160829t063212-20160829t063231-001828-002c63-001_filter

s1b-iw-grd-hv-20160829t063212-20160829t063231-001828-002c63-002_winddir

s1b-iw-grd-hh-20160829t063212-20160829t063231-001828-002c63-001_winddir