undef

s1a-ew-grd-vh-20160901t203030-20160901t203108-012864-0144f0-002_filter

s1a-ew-grd-vv-20160901t203030-20160901t203108-012864-0144f0-001_filter

s1a-ew-grd-vv-20160901t203030-20160901t203108-012864-0144f0-001_winddir

s1a-ew-grd-vh-20160901t203030-20160901t203108-012864-0144f0-002_winddir