Skrifennow

My blog, imported from Blogger and converted using Jekyll.

Probably not the Aurora Borealis

Oct 9, 2015

From time to time, the Aurora Borealis can be visible from the UK, and the Twitter accounts AuroraWatch UK and BGS Aurora Alert can be useful in getting warning of this. It is relatively rare that it is visible as far south as Cornwall, but I did have a look at around 11pm BST on 8th October and took some not very convincing pictures of the northern sky, where there was mist illuminated by artificial lights.


More pictures at my Google+ album.

Maps of Wales with slope arrows

Oct 9, 2015

Here are a couple of maps of Aberystwyth, and Cadair Idris, with the RSGISlib segmented digital elevation model.
Slope direction is shown by arrows, and coloured in the same scheme as previously with thicker arrows for steeper slopes, and longitudinal curvature indicated with convex slopes red and concave blue.

1:10000 seems about the limit of the smallest scale that QGIS will cope with the arrowed lines. Beyond that the computer just hangs - slope lines without arrows can be plotted without problem.

Aberystwyth town centre, and the university campus. full-res version

Cadair Idris. This is a textbook example of a glacial landscape in the British Isles. full-res version
Aberystwyth area and Rheidol Valley. full-res version

Dyfi Estuary showing Borth, Tywyn and Machynlleth. full-res version
To readers: are there any requests of areas you would like to see?

The processed data currently includes the following area though I also have the whole of British Isles (except most of Shetland) DEM from 1 arcsec SRTM (and could download anywhere up to 60° latitude) but not processed to create slope curvature layers and segmented.



































Pen-y-fan area, Brecon Beacons

Pen-y-fan main summit to the right of centre, showing the slopes convex at the top, but generally concave further down. full-res version
Broader context at 1:40000. full-res version


A greyscale version of my maps in Cornish

Oct 8, 2015

I have made a greyscale version of the maps in Cornish I have been working on.

Here is an extract from the Truro area:

Cornish placenames from MAGA Placename and Signage Panel and the book by Craig Weatherhill. Some names of geographic features are my own translations of English names. Any errors are my own responsibility. large version



Adding arrows to indicate the (downward) slope direction using the segmentation method described in earlier posts. large version
Keeping the map greyscale but showing longitudinal curvature of the slope with convex slopes in red and concave in blue. large version
Penzance. Unfortunately using the arrows tends to make QGIS run very slowly and crash for larger maps. larger version

Akademi Kernewek

Oct 3, 2015

Yth esen vy yn kuntelles an myttin ma, avel 'Forum Yeth Kernewek - Cornish Language Forum' ow keskewsel gans pobel diworth Konsel Kernow, eseli bagaosow yeth ha kernewegoryon erell, a-dro dhe towlennow chanjya furv a wra Konsel Kernow owth oberi a-rag Kernewek.

Nyns o pubonan unnverhes an chanj yw da, nebes a leveris y fia gwell kavoes arghasans hir-dermyn hag ena gorra framweyth nowydh, wosa chanjya an framweyth kyns ambos anodho, mes ny vynnav skrifa meur a'n mater na.

Yma towlenn sevel 'Akademi Kernewek' dhe pesya an ober gans gerlyver FSS, henwyn leow, h.e.

Yma nebes Akademiow Yeth a-dro dhe'n bys, rol diworth Wikipedia. An huni yn Latvia a wrug seulabrys dewis ger rag 'hipster'.

Yma Akademi Yeth yn Pow Chekk, an brassa rann a'ga gwiasva yw yn Chekk mes i a wra gwiasva rag gerlyver ha gidyans gramasek ha taklow an par na.


Ebrenn y'n nos - mis-Gwynngala 2015 - audio

Sep 28, 2015

I have now recorded the September episode of Ebrenn y'n Nos.

See my earlier post for a transcript.

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