undef

s1b-iw-grd-vh-20170621t095205-20170621t095235-006147-00acc8-002_filter

s1b-iw-grd-vv-20170621t095205-20170621t095235-006147-00acc8-001_filter

s1b-iw-grd-vh-20170621t095205-20170621t095235-006147-00acc8-002_winddir

s1b-iw-grd-vv-20170621t095205-20170621t095235-006147-00acc8-001_winddir