undef

s1a-ew-grd-hh-20160713t160356-20160713t160458-012132-012caf-001_filter

s1a-ew-grd-hv-20160713t160356-20160713t160458-012132-012caf-002_filter

s1a-ew-grd-hh-20160713t160356-20160713t160458-012132-012caf-001_winddir

s1a-ew-grd-hv-20160713t160356-20160713t160458-012132-012caf-002_winddir