What are surface changes?

Deployment of a remotely operated vehicle
What is the surface:
Sediment-covered seafloor with no special features that distinguishes one spot from another.


What is a change in the surface?
Features in or on top of the sediment that are distinguishable from the normal background sediments.


How are surface changes identified?
Optically with a Digital underwater imagery:
This method describes an automated system for thematic mapping based on photo mosaics of images taken of the seafloor obtained during ROV or AUV operations.

Thereby, the ROV or the AUV has to be equipped with a high-resolution digital still camera to collect a large data set of seabed images.
Subsequently, underwater mosaics are generated by registering and blending large sets of images acquired at a close range.