undef

s1b-iw-grd-vh-20171023t062922-20171023t062947-007953-00e0c6-002_filter

s1b-iw-grd-vv-20171023t062922-20171023t062947-007953-00e0c6-001_filter

s1b-iw-grd-vv-20171023t062922-20171023t062947-007953-00e0c6-001_winddir

s1b-iw-grd-vh-20171023t062922-20171023t062947-007953-00e0c6-002_winddir