undef

s1a-ew-grd-hv-20160711t162022-20160711t162124-012103-012bc2-002_filter

s1a-ew-grd-hh-20160711t162022-20160711t162124-012103-012bc2-001_filter

s1a-ew-grd-hv-20160711t162022-20160711t162124-012103-012bc2-002_winddir

s1a-ew-grd-hh-20160711t162022-20160711t162124-012103-012bc2-001_winddir