Filter out unmapped reads
Category Read Filters
OverviewFilter out unmapped reads.
Unmapped reads are defined by three criteria:
- SAM flag value 0x4
- An asterisk for reference name or RNAME (column 3 of a SAM record)
- A zero value for leftmost mapping position for POS (column 4 of SAM record)
GATK version 22.214.171.124-SNAPSHOT built at Mon, 19 Oct 2020 11:41:12 -0400.