undef

s1b-ew-grd-hv-20170728t105218-20170728t105318-006687-00bc32-002_filter

s1b-ew-grd-hh-20170728t105218-20170728t105318-006687-00bc32-001_filter

s1b-ew-grd-hh-20170728t105218-20170728t105318-006687-00bc32-001_winddir

s1b-ew-grd-hv-20170728t105218-20170728t105318-006687-00bc32-002_winddir