undef

s1a-iw-grd-vh-20180418t215231-20180418t215305-021527-02517e-002_filter

s1a-iw-grd-vv-20180418t215231-20180418t215305-021527-02517e-001_filter

s1a-iw-grd-vh-20180418t215231-20180418t215305-021527-02517e-002_winddir

s1a-iw-grd-vv-20180418t215231-20180418t215305-021527-02517e-001_winddir