Non-contact relative depth derivation for seismic nodes on a seafloor surface

A system for determining relative depths of seismic nodes, the system comprising:

• a moveable subsea unit;
• a camera system attached to the moveable subsea unit at a first attachment location;
• one or more pressure sensors attached to the moveable subsea unit and associated with a second attachment location, wherein the second attachment location is a reference location for the one or more pressure sensors;
• at least one processor;
• and
• a memory storing instructions which when executed by the at least one processor, causes the at least one processor to:
• obtain, using the camera system, image data of a scene associated with a plurality of seismic nodes deployed on a seafloor surface;
• analyze the image data to detect a configured tracking pattern within the scene, wherein the configured tracking pattern is attached to a respective seismic node of the plurality of seismic nodes;
• determine depth information corresponding to the moveable subsea unit, wherein the depth information is determined based on sensor data obtained from the one or more pressure sensors;
• determine, using the image data, relative positioning information between the camera system and the configured tracking pattern detected within the scene;
• and
• combine the depth information and the relative positioning information to determine a derived depth of the respective seismic node deployed on the seafloor surface.