Total (unfiltered) depth over all samples.
While the sample-level (FORMAT) DP field describes the total depth of reads that passed the caller's internal quality control metrics (like MAPQ > 17, for example), the INFO field DP represents the unfiltered depth over all samples. Note though that the DP is affected by downsampling (-dcov), so the max value one can obtain for N samples with -dcov D is N * D
GATK version 3.2-2-gec30cee built at 2014/07/17 17:54:48. GTD: NA