Most used surveys, for example, in order to identify unoccupied properties, the characteristics of second homeowners, and patterns of second home usage.
Holiaduron a ddefnyddiwyd gan y mwyafrif, er enghraifft, i nodi eiddo gwag, nodweddion perchnogion ail gartrefi, a phatrymau defnyddio ail gartref.