undef

s1a-ew-grd-vh-20180831t082908-20180831t083008-023488-028ea1-002_filter

s1a-ew-grd-vv-20180831t082908-20180831t083008-023488-028ea1-001_filter

s1a-ew-grd-vv-20180831t082908-20180831t083008-023488-028ea1-001_winddir

s1a-ew-grd-vh-20180831t082908-20180831t083008-023488-028ea1-002_winddir