The Co. Louth Ordnance Survey Letters, 1835-6
نویسندگان
چکیده
منابع مشابه
Accuracy of Heights from Ordnance Survey Maps
1) Spot heights at summits have an accuracy of about ±3.3m at all map scales, in agreement with the published figure. 2) Levelled heights from old 6-inch maps can be a few metres below the summit but are unlikely to be more than a few tenths of a metre higher. 3) The accuracy of old and new 1:50k maps is similar, but where heights have changed the old height has a tendency to be too low. 4) Spo...
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ژورنال
عنوان ژورنال: Journal of the County Louth Archaeological Society
سال: 1916
ISSN: 1393-2195
DOI: 10.2307/27728093