undef

s1a-iw-grd-vh-20180528t062206-20180528t062231-022101-0263a7-002_filter

s1a-iw-grd-vv-20180528t062206-20180528t062231-022101-0263a7-001_filter

s1a-iw-grd-vh-20180528t062206-20180528t062231-022101-0263a7-002_winddir

s1a-iw-grd-vv-20180528t062206-20180528t062231-022101-0263a7-001_winddir