undef

s1a-iw-grd-vv-20160718t042321-20160718t042346-012198-012edb-001_filter

s1a-iw-grd-vh-20160718t042321-20160718t042346-012198-012edb-002_filter

s1a-iw-grd-vv-20160718t042321-20160718t042346-012198-012edb-001_winddir

s1a-iw-grd-vh-20160718t042321-20160718t042346-012198-012edb-002_winddir