undef

s1b-iw-grd-vh-20170112t084907-20170112t084936-003813-0068db-002_filter

s1b-iw-grd-vv-20170112t084907-20170112t084936-003813-0068db-001_filter

s1b-iw-grd-vv-20170112t084907-20170112t084936-003813-0068db-001_winddir

s1b-iw-grd-vh-20170112t084907-20170112t084936-003813-0068db-002_winddir