undef

s1a-iw-grd-vh-20180524t215204-20180524t215233-022052-02621a-002_filter

s1a-iw-grd-vv-20180524t215204-20180524t215233-022052-02621a-001_filter

s1a-iw-grd-vh-20180524t215204-20180524t215233-022052-02621a-002_winddir

s1a-iw-grd-vv-20180524t215204-20180524t215233-022052-02621a-001_winddir