undef

s1a-ew-grd-hh-20160801t173359-20160801t173459-012410-0135d5-001_filter

s1a-ew-grd-hv-20160801t173359-20160801t173459-012410-0135d5-002_filter

s1a-ew-grd-hv-20160801t173359-20160801t173459-012410-0135d5-002_winddir

s1a-ew-grd-hh-20160801t173359-20160801t173459-012410-0135d5-001_winddir