undef

s1a-iw-grd-vv-20170902t133647-20170902t133712-018197-01e94d-001_filter

s1a-iw-grd-vh-20170902t133647-20170902t133712-018197-01e94d-002_filter

s1a-iw-grd-vh-20170902t133647-20170902t133712-018197-01e94d-002_winddir

s1a-iw-grd-vv-20170902t133647-20170902t133712-018197-01e94d-001_winddir