undef

s1a-iw-grd-vh-20180815t104155-20180815t104220-023256-02872e-002_filter

s1a-iw-grd-vv-20180815t104155-20180815t104220-023256-02872e-001_filter

s1a-iw-grd-vv-20180815t104155-20180815t104220-023256-02872e-001_winddir

s1a-iw-grd-vh-20180815t104155-20180815t104220-023256-02872e-002_winddir