undef

s1a-iw-grd-vh-20150926t160016-20150926t160044-007888-00b015-002_filter

s1a-iw-grd-vv-20150926t160016-20150926t160044-007888-00b015-001_filter

s1a-iw-grd-vh-20150926t160016-20150926t160044-007888-00b015-002_winddir

s1a-iw-grd-vv-20150926t160016-20150926t160044-007888-00b015-001_winddir