undef

s1b-iw-grd-vv-20170804t084914-20170804t084943-006788-00bf1a-001_filter

s1b-iw-grd-vh-20170804t084914-20170804t084943-006788-00bf1a-002_filter

s1b-iw-grd-vh-20170804t084914-20170804t084943-006788-00bf1a-002_winddir

s1b-iw-grd-vv-20170804t084914-20170804t084943-006788-00bf1a-001_winddir