undef

s1a-iw-grd-vh-20171204t063015-20171204t063040-019549-021310-002_filter

s1a-iw-grd-vv-20171204t063015-20171204t063040-019549-021310-001_filter

s1a-iw-grd-vh-20171204t063015-20171204t063040-019549-021310-002_winddir

s1a-iw-grd-vv-20171204t063015-20171204t063040-019549-021310-001_winddir