undef

s1a-iw-grd-vh-20160901t234349-20160901t234414-012866-01450e-002_filter

s1a-iw-grd-vv-20160901t234349-20160901t234414-012866-01450e-001_filter

s1a-iw-grd-vv-20160901t234349-20160901t234414-012866-01450e-001_winddir

s1a-iw-grd-vh-20160901t234349-20160901t234414-012866-01450e-002_winddir