Cemaes Fawr (SH 379 928)
There has been a Significant Name Change to a hill that is listed in the 30-99m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Cemaes Fawr (SH 379 928) |
30-99m
Twmpau – Welsh hills at or above 30m
and below 100m in height that have 30m minimum drop, with an accompanying sub list entitled the 30-99m
Sub-Twmpau with the criteria for this sub category being all Welsh hills at or
above 30m and below 100m in height with 20m or more and below 30m of drop, with
the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
The 30-99m Twmpau by Myrddyn Phillips |
When the original 30-99m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed under the point (Pt. 56m) notation with an estimated c 22m of drop based on the 56m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 34m bwlch height based on interpolation of 5m contouring between 30m – 35m.
Extract from the Ordnance Survey 1:25,000 Explorer map |
Extract from the Tithe map |
Extract from the apportionments |
The full details for the hill are:
Group: Ynys Môn
Name: Cemaes Fawr
Previously Listed Name: Pt. 56m
OS 1:50,000 map: 114
Summit Height: 55.9m (LIDAR)
Summit Grid Reference: SH 37927 92898 & SH 37925 92896 & SH 37927 92896 (LIDAR)
Bwlch Height: c 34m (interpolation)
Bwlch Grid Reference: SH 38185 93111 (interpolation)
Drop: c 22m (LIDAR summit and interpolated bwlch)
Myrddyn Phillips (July
2021)
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