undef

s1a-iw-grd-vh-20170902t133737-20170902t133802-018197-01e94d-002_filter

s1a-iw-grd-vv-20170902t133737-20170902t133802-018197-01e94d-001_filter

s1a-iw-grd-vv-20170902t133737-20170902t133802-018197-01e94d-001_winddir

s1a-iw-grd-vh-20170902t133737-20170902t133802-018197-01e94d-002_winddir