undef

s1a-iw-grd-vv-20171125t215204-20171125t215234-019427-020f40-001_filter

s1a-iw-grd-vh-20171125t215204-20171125t215234-019427-020f40-002_filter

s1a-iw-grd-vh-20171125t215204-20171125t215234-019427-020f40-002_winddir

s1a-iw-grd-vv-20171125t215204-20171125t215234-019427-020f40-001_winddir