undef

s1b-iw-grd-vh-20170617t084911-20170617t084940-006088-00ab14-002_filter

s1b-iw-grd-vv-20170617t084911-20170617t084940-006088-00ab14-001_filter

s1b-iw-grd-vh-20170617t084911-20170617t084940-006088-00ab14-002_winddir

s1b-iw-grd-vv-20170617t084911-20170617t084940-006088-00ab14-001_winddir