undef

s1a-iw-grd-vh-20160126t100922-20160126t100947-009664-00e172-002_filter

s1a-iw-grd-vv-20160126t100922-20160126t100947-009664-00e172-001_filter

s1a-iw-grd-vh-20160126t100922-20160126t100947-009664-00e172-002_winddir

s1a-iw-grd-vv-20160126t100922-20160126t100947-009664-00e172-001_winddir