Curved Ridge Database of British and Irish Hills
The Hills Database

Fan Brycheiniog survey

Surveying Fan Brycheiniog
DoBIH 10yr anniversary, 13 Sept 2011

Wild Boar Fell survey

Surveying Wild Boar Fell
DoBIH Editors meeting, 13 Oct 2012

Surveying
In 2006 two DoBIH editors, John Barnard and Graham Jackson, began to generate accurate hill data using professional surveying equipment. In 2009 they established G&J Surveys to undertake work for other clients. All the team's results are fed into the DoBIH. More recently other hillgoers have taken up the challenge, and the database benefits from many survey measurements supplied by Alan Dawson, Myrddyn Phillips and MountainViews. For details see the Database Notes and the links below.
Measurement
  • Accuracy of heights from Ordnance Survey maps
    A statistical analysis of the accuracy of summit and col heights obtained from OS maps, based on a comparison with over 700 accurately surveyed heights. The study covers air survey heights at different map scales, old levelled heights, benchmarks and interpolated heights.
  • The use of altimeters in height measurement
    A scientific and statistical treatment of the sources of error in height measurements by altimeter. A procedure for correcting for temperature and barometric drift is described and tested in the hills. A shortened version, without the maths, was published in TAC43.

    Knight's Peak has now been surveyed. This does not change the conclusions in the article.

  • Allowing for measurement error: a principled approach to peak bagging
    Why doing the 284 Munros gives you only a 21% probability of having climbed all the significant Scottish hills over 3,000ft. A slightly improved version of the author's article in TAC36.

    Since the article was written, the heights of all borderline Munros have been measured accurately by surveys commissioned by The Munro Society. Surveys have promoted three hills previously mapped at 609m to the lists of Welsh and English 2000ft summits. Other surveys have created new Marilyns, Humps, Deweys, Nuttalls and Tumps. We anticipate that the status of all borderline hills in the most popular lists will eventually be established beyond doubt, but in the meantime you should climb the subs!

An examination of Naismith's Rule
Postponed indefinitely: a statistical analysis of hillwalkers' data to test the performance of Naismith's Rule in calculating the time taken to complete a walk, and examine alternative models.

The data were analysed in 2000 but the best fitting models are not very intuitive. For those with a mathematical bent, results are available in Excel from the author.

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