undef

s1b-iw-grd-vv-20170101t174940-20170101t175005-003658-00645d-001_filter

s1b-iw-grd-vh-20170101t174940-20170101t175005-003658-00645d-002_filter

s1b-iw-grd-vv-20170101t174940-20170101t175005-003658-00645d-001_winddir

s1b-iw-grd-vh-20170101t174940-20170101t175005-003658-00645d-002_winddir