undef

s1a-iw-grd-vv-20150920t175834-20150920t175859-007802-00adb8-001_filter

s1a-iw-grd-vh-20150920t175834-20150920t175859-007802-00adb8-002_filter

s1a-iw-grd-vh-20150920t175834-20150920t175859-007802-00adb8-002_winddir

s1a-iw-grd-vv-20150920t175834-20150920t175859-007802-00adb8-001_winddir