OpenStreetMap

OSM & Britain’s Most Upwardly-Mobile Village

Posted by alexkemp on 11 May 2018 in English (English)

You may have missed the reports in April about Willand, a pretty little village in Devon that is 2cm (0.7 inches) closer to god each year (from the heliocentric view, of course), yet no-one knows why:

Willand village in Devon

The connection to OSM is a little tortuous, but real.

The University of Nottingham has a Geography department, and it has spun off a commercial company called Geomatic Ventures Limited (GML). GML has created a United Kingdom Relative Deformation Map using results from the Sentinel-1 satellite. Here is the blurb from the mangomap site:

United Kingdom Relative Deformation Map

A relative deformation map of the United Kingdom, generated from ~ 2000 Sentinel-1 images acquired between October 2015 - October 2017. The data was processed using the Intermittent Small Baseline Subset (ISBAS) InSAR method. Each pixel represents the average vertical height change over the period of observations in millimetres per year.

There is an extensive history of coal-mining throughout Britain, almost all of which is now defunct. The seam that Gedling Pit, Nottinghamshire was following eastwards just before closure in 1991 runs under Nottingham itself; in fact, Dowson Street (just round the corner from me) is the very street above where they stopped underground. Most of those mines were continuously pumped to keep them free of water, and that stopped at closure. There are thus both blue areas on the GVL mangomap (rising ground) due to re-flooding and red areas (falling ground) due to collapsing seams within those former mining areas.

The point of Willand is:

  1. It has the fastest rise in Britain
  2. No-one has a clue as to why!

What has OSM got to do with this?

There is a flyout within the map that allows you to add a Base Map to the Deformation Map, and the first two choices are both OSM. Very nice.

2018-05-22: Added OSM / Wikipedia links for Willand, Gedling, Dowson Street & Nottingham.

Location: Willand, Mid Devon, Devon, South West England, England, United Kingdom

Comment from Alan Bragg on 11 May 2018 at 10:52

Welcome back! Missed reading your posts.

Comment from alexkemp on 11 May 2018 at 11:12

@Alan: I'll try to post more often, but no promises.

Comment from andy mackey on 16 May 2018 at 05:50

Alex i have enjoyed your articles in the past. Welcome back.

Comment from zarl on 16 May 2018 at 07:30

I´m also always eagerly waiting for your stories, comments, sightings and observations you share with us. Thanks!

Comment from Riccardo Stagni on 21 May 2018 at 14:36

Yup, thank you for your articles! :)

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