undef

s1a-iw-grd-vv-20160407t100923-20160407t100948-010714-00ffb0-001_filter

s1a-iw-grd-vh-20160407t100923-20160407t100948-010714-00ffb0-002_filter

s1a-iw-grd-vh-20160407t100923-20160407t100948-010714-00ffb0-002_winddir

s1a-iw-grd-vv-20160407t100923-20160407t100948-010714-00ffb0-001_winddir