undef

s1a-iw-grd-vh-20151210t062140-20151210t062205-008976-00cde1-002_filter

s1a-iw-grd-vv-20151210t062140-20151210t062205-008976-00cde1-001_filter

s1a-iw-grd-vh-20151210t062140-20151210t062205-008976-00cde1-002_winddir

s1a-iw-grd-vv-20151210t062140-20151210t062205-008976-00cde1-001_winddir