Here is the North of Mars, showing the Mars Express High Resolution Stereo Camera tiles used in my MSc dissertation, colour-coded by elevation, but also with the output of the Bayesian classifier measuring the similarity to Colin Souness's glacial form.

This is possibly a bit too colourful and the classifier output isn't really useful at this scale. The segmented DTM has red indicating similarity to glacier 'head' areas, green for 'context' areas (9x area of extent) and blue for extents.

I use QGIS to blend the elevation with an underlying nadir image also from HRSC with "Hard Light". I am not sure whether the developers of QGIS intended the Red Dwarf reference.


The coordinates are in an equirectangular projection in metres optimised for a standard latitude of 40°.

In a previous post, I mentioned the work of Shennan and Horton (2002) about sea level change around Britain through the Holocene.

I showed a visualisation of the West Cornwall coastline as it may have been around 12,000 years before present.

After downloading further bathymetry via the UKHO INSPIRE portal, I present an updated version covering the whole area around Cornwall.

Much of this came as .csv point data, which I had to grid, and use the QGIS Concave Hull plugin from the Processing toolbox to restrict the interpolated grid to where there was data.

In some areas, there are gaps in what is currently available at high resolution so it falls back to low-resolution data.

Based on my reading off the graphs in Shennan and Horton, the sea level rise at this time should be similar across the area covered here:
 

Site Number

Site Name

Lat

Long

RSL 1kyr

RSL 2kyr

RSL 3kyr

RSL 4kyr

RSL 5kyr

RSL 6kyr

RSL 7kyr

RSL 8kyr

RSL 9kyr

RSL 10kyr

RSL 11 kyr

RSL 12 kyr

42	Pembroke	51.8	-5.1	-0.8	-1.6	-2.4	-3.2	-4	-9.2	-14.4	-19.6	-24.8	-30	-35.2	-40.4
43	Glamorgan	51.5	-3.7	-2	-4	-6	-8	-10	-13.6	-17.2	-20.8	-24.4	-28	-31.6	-35.2
51	Devon	50.4	-3.5	-1	-2	-3	-4	-5	-10	-15	-20	-25	-30	-35	-40
52	Cornwall	50.2	-5.5	-1.4	-2.8	-4.2	-5.6	-7	-11.6	-16.2	-20.8	-25.4	-30	-34.6	-39.2

It is clear there were substantial areas of land that were disappearing in the millenia after the reoccupation of Britain after the last glacial maximum (with this map corresponding to the cold spell of the Younger Dryas).
In the period of time, between 12kyr BP and 8kyr BP sea level rose by 20m, which corresponds to half a metre every century.
Especially in the large expanses of gently sloping terrain off the north coast, it would be likely that coastal retreat would have been noticeable by people within a single lifetime.

A version speculating about woodland colonising the lowlands:

11 y'n nos, yn kres mis-Hedra

Diworth Adam Evans dre Wikimedia Commons

An loor: 

Kwartron diwettha yw an 4a mis-Hedra, loor nowydh yw 12ves mis-Hedra, kynsa kwartron vydh 20ves mis-Hedra, ha'n loor leun vydh dhe'n 27ves.

 

Planetys kyns an howldrevel (16ves mis-Hedra)

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.

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