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Ar yr un pryd, gall eira sy’n lluwchio neu’n dadmer, neu farrug sy’n dadmer ar borfa wedi’i gwella, helpu i ddangos mân wahaniaethau yn y dopograffeg a all wneud i olion archaeolegol sefyll allan. Pur anaml y bydd yr amodau tywydd hyn yn para’n hir, felly mae’n hollbwysig mynd ati ar unwaith i dynnu lluniau o’r awyr.
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Snow offers a rare opportunity for seeing and recording sites in their Welsh landscape which, when covered by a blanket of snow, provide immaculate conditions for earthwork recording especially when combined with the low winter sun. Snow evens out the colours of the landscape allowing complex earthwork monuments to be seen more clearly and precisely. At the same time drifting or melting snow, as well as melting frost on improved pasture, all help to show up slight differences in topography which can highlight an archaeological site. These special weather conditions rarely last long making timely aerial reconnaissance imperative. These images are a selection from winters past. Let us hope there is an opportunity for more discoveries this year.
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