A statutory declaration is a legal document prepared in front of a solicitor. It is similar to a statement made under oath but is not sworn.
Statutory declarations are commonly used to allow a person to affirm something to be true for the purposes of satisfying a legal requirement or regulation, where no other evidence is available.
In this case it is our legal affirmation that the relevant photography is as described and fit for the purposes of satisfying your legal requirement in the adverse possession situation.