undef

s1b-iw-grd-vh-20171019t095210-20171019t095240-007897-00df2d-002_filter

s1b-iw-grd-vv-20171019t095210-20171019t095240-007897-00df2d-001_filter

s1b-iw-grd-vv-20171019t095210-20171019t095240-007897-00df2d-001_winddir

s1b-iw-grd-vh-20171019t095210-20171019t095240-007897-00df2d-002_winddir