undef

s1a-iw-grd-vv-20160914t175835-20160914t175900-013052-014b00-001_filter

s1a-iw-grd-vh-20160914t175835-20160914t175900-013052-014b00-002_filter

s1a-iw-grd-vv-20160914t175835-20160914t175900-013052-014b00-001_winddir

s1a-iw-grd-vh-20160914t175835-20160914t175900-013052-014b00-002_winddir