A sign of things to come. The Pembs Coast National Park has recently commissioned LIDAR imagery of much of North Pembs -- I think the flying was completed in January or February, So we can expect fantastic imagery to be published before too long -- from which we will be able to extract mammoth quantities of information -- relating to archaeology and geomorphology.
Until now, very little of Pembrokeshire has had LIDAR imaging done. One small section is published above -- showing Pentre Ifan Wood in extraordinary detail.
Something suspicious is showing up here, at top centre in the image, on the northern edge of the wood, between Trewern on the left and Pentre Ifan Urdd Centre on the right.
I am rather more interested in the deep channel right in the middle of the wood, that leads nowhere but which has clearly carried water westwards. It has to be a glacial meltwater channel, somewhat like the channels in Tycanol Wood, but it is very inaccessible -- the vegetation is very thick indeed in the wood, and proper field research there is almost impossible........
PS.
Here is the source of the LIDAR material. You can zoom in on it and get high definition nimages:
4 comments:
That is intriguing. I know these woods so well. I would be more interested in the more southerly section, not covered in this image, that covers the upland, the fort and the area around Pentre Ifan.
Do you mean that circular feature containing a blob at its centre? The map has that as a pond.
In that field the footpath that leaves the Urdd Centre towards Trewern uses a track on a distinct raised ridge.
This is some old LIDAR coverage, which is very haphazard and just covers some strips in Pembs. The coverage I found doesn't go any further south.
I'm trying to find out when the new LIDAR coverafge will be made available..... but there seem to be other LIDAR bits and pieces too, available from the NRW web site. Am checking some of them out......
This is the best point for access
http://lle.gov.wales/GridProducts#data=LidarCompositeDataset
There is a bit of complexity here DSM shows the hedges, DTM has the hedges removed.
The jpg versions can be read by anyone, the ASC versions are point files that are best read in a GIS.
The whole of Wales is meant to be covered by a one metre resolution Lidar, but we have been waiting for over two years. When that is complete, it will probably be published here. The currently available data was created by NRW for monitoring rain flows leading to flooding in valleys, so the lower land is all well covered, by the higher areas not so well.
Dave
Thanks Dave -- yes, I have seen those files from the official site -- but am unable to open most of them.. The bits I am able to look at seem to be a pretty random assortment, concentrating on built-up areas.......
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