undef

s1a-ew-grd-hv-20160716t162828-20160716t162938-012176-012e19-002_filter

s1a-ew-grd-hh-20160716t162828-20160716t162938-012176-012e19-001_filter

s1a-ew-grd-hh-20160716t162828-20160716t162938-012176-012e19-001_winddir

s1a-ew-grd-hv-20160716t162828-20160716t162938-012176-012e19-002_winddir