undef

s1b-iw-grd-vh-20170825t095836-20170825t095901-007095-00c80b-002_filter

s1b-iw-grd-vv-20170825t095836-20170825t095901-007095-00c80b-001_filter

s1b-iw-grd-vv-20170825t095836-20170825t095901-007095-00c80b-001_winddir

s1b-iw-grd-vh-20170825t095836-20170825t095901-007095-00c80b-002_winddir