PD0 is a binary industry standard data format that describes the velocity profile as a function of depth, along with other parameters (such as backscatter intensity), derived metrics, and metadata. The PD0 record contains data for all beams – for example, one PD0 record contains data for all five Origin 600 beams.

PD0 is a flexible, self-describing data format. It consists of a fixed-length header of 6 bytes, followed by Nx2 bytes which describe the byte-offset of the N sections present in each PD0 ‘ensemble’. Each of the N sections contains a 16-bit unsigned integer which describes a unique identifier for the contents of each section. The PD0 record finishes with a 2-byte reserved field followed by a 2-byte checksum.

• PD0 water velocities are always logged in beam frame
• Origin always logs PD0 format data to disk
• All PD0 files are identified by a ‘.pd0’ extension

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