undef

s1a-iw-grd-vh-20180913t221945-20180913t222010-023686-0294f7-002_filter

s1a-iw-grd-vv-20180913t221945-20180913t222010-023686-0294f7-001_filter

s1a-iw-grd-vh-20180913t221945-20180913t222010-023686-0294f7-002_winddir

s1a-iw-grd-vv-20180913t221945-20180913t222010-023686-0294f7-001_winddir