undef

s1a-iw-grd-vv-20180516t062205-20180516t062230-021926-025e18-001_filter

s1a-iw-grd-vh-20180516t062205-20180516t062230-021926-025e18-002_filter

s1a-iw-grd-vv-20180516t062205-20180516t062230-021926-025e18-001_winddir

s1a-iw-grd-vh-20180516t062205-20180516t062230-021926-025e18-002_winddir