undef

s1a-iw-grd-vh-20160514t062143-20160514t062208-011251-01106b-002_filter

s1a-iw-grd-vv-20160514t062143-20160514t062208-011251-01106b-001_filter

s1a-iw-grd-vh-20160514t062143-20160514t062208-011251-01106b-002_winddir

s1a-iw-grd-vv-20160514t062143-20160514t062208-011251-01106b-001_winddir