Mae LLYW.CYMRU yn defnyddio cwcis sy'n hanfodol i'r safle weithio. Defnyddir cwcis nad ydynt yn hanfodol hefyd i deilwra a gwella gwasanaethau. Trwy barhau i ddefnyddio'r safle, rydych yn cytuno ein bod ni'n defnyddio cwcis.
Diffiniad: The practice of measuring locations and boundaries. Using precision instruments, surveying provides exact measurements of the absolute location of places and their relative position to each other, and traditionally has provided the raw data for map-making by plotting the positions of objects, the paths between them, and the boundaries of parcels of land.
