undef

s1a-ew-grd-vh-20190329t140231-20190329t140336-026553-02f9ec-002_filter

s1a-ew-grd-vv-20190329t140231-20190329t140336-026553-02f9ec-001_filter

s1a-ew-grd-vv-20190329t140231-20190329t140336-026553-02f9ec-001_winddir

s1a-ew-grd-vh-20190329t140231-20190329t140336-026553-02f9ec-002_winddir