undef

s1a-iw-grd-vv-20180124t215242-20180124t215305-020302-022ab2-001_filter

s1a-iw-grd-vh-20180124t215242-20180124t215305-020302-022ab2-002_filter

s1a-iw-grd-vh-20180124t215242-20180124t215305-020302-022ab2-002_winddir

s1a-iw-grd-vv-20180124t215242-20180124t215305-020302-022ab2-001_winddir