Tag

surveying

21
Jun
2018
0

150-year-old Stonehenge photos unearthed on the Summer Solstice

They are some of the oldest photographs ever taken of the ancient Stonehenge landmark and the book in which they are bound dates back to 1867. It’s a chronicle which until now has been lost in the archives of the national mapping agency Ordnance Survey.

From an original albumen print in the 1867 book ‘Plans and Photographs of Stonehenge and of Turusachan in the Island of Lewis; with notes relating to the Druids and Sketches of Cromlechs in Ireland, by Colonel Sir Henry James, Director General of the Ordnance Survey

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1
May
2018
2

25 years since the last OS benchmark

You may know about our trig pillars, but did you know that there are more nostalgic reminders of how we used to map Great Britain?

A post shared by jbowersuk (@jbowersuk) on


Have you ever seen one of these while you’ve been out and about? If so, it is highly likely you have spotted one of our renowned benchmarks. 2018 marks 25 years since the last traditionally-cut arrow style benchmark was carved on a milestone located outside The Fountain pub in Loughton.

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7
Mar
2018
4

See historic photos from Ordnance Survey on Timepix

The Timepix historic photo site launches today and makes a unique set of photos from OS’ history available online for the first time. Over 21,000 photos catalogue the Manchester streets between the 1940s and 1960s, giving a unique insight into the city’s past captured by OS surveyors. From children and animals photobombing the surveyors, to a background of vintage adverts, Timepix showcases a fascinating collection of photos around Greater Manchester.

Why were OS surveyors photographing Manchester?

OS surveyors took revision point (RP) photos across Britain to provide a network of surveyed locations. These known spots could then be used to ‘control’ the position of detail on a large scale map. RPs were often on corners of buildings and other immovable features, and were fixed to centimetre accuracy. Finding the RPs for future map updates was an issue, and photography quickly became the best visual reference – leading to thousands of photos of men with white arrows… Read More

21
Sep
2017
1

Benchmark or trig pillar: what’s in a name?

We’ve had a few questions recently about benchmarks and trig pillars and what they are and how they differ, so we thought we’d clear it up.

The benchmark

Most weeks we’ll see a Twitter conversation where someone is asking what this mark is:

Many think it is War Office-related, but it is in fact an OS benchmark (BM) and a means of marking a height above sea level. Surveyors in our history made these marks to record height above Ordnance Datum Newlyn (ODN – mean sea level determined at Newlyn in Cornwall). If the exact height of one BM was known, the exact height of the next could be found by measuring the difference in heights, through a process of spirit levelling. They can be found cut into houses, churches, bridges and many other structures. There are hundreds of thousands of them dotted across Great Britain, although we no longer use them today. Read More

19
Sep
2017
0

Taking White Hart Lane off the map

We usually share stories about our teams adding new features to the map, such as the Queensferry Crossing or even a whale, but we also have to remove features from our database. London-based surveyor Tony Killilea was recently tasked with removing a football stadium from the map…

With over 500 million geospatial features across Great Britain and some 10,000 changes taking place in the database each day, it’s not difficult to understand how our surveying teams are kept busy. From new roads to new shopping centres, it’s easy to forget about the existing features that have to be removed for new developments to be built.

Tony at White Hart Lane

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28
Jul
2017
0

Putting The Sill on the map

Opening tomorrow, during National Parks Week 2017, is The Sill National Landscape Discovery Centre in Northumberland National Park. Our surveyor Richard Bennett was on site recently to ensure the building was added to the map.

The Sill is the result of a partnership between the National Park and YHA England and Wales, including space for exhibitions, a café, a Youth Hostel, a rural business hub, and a shop specialising in local crafts and produce.

Richard was on hand to measure every aspect of the site and add the featured to 550 million in our geospatial database. His GNSS receiver locks on to several satellites and a series of ground stations (that’s right, no trig pillars required!) and the calculations are accurate to within a few centimetres. Read More

31
May
2017
4

New beach huts added to the mapping database for GB

A stunning development of new beach huts on the south coast has been added to our geospatial database ahead of the summer season.

The development, in Milford on Sea, replaces the old beach huts which were damaged and destroyed during a fierce storm on 14 February 2014. With building work on 119 beach huts and the surrounding area reaching a conclusion, it provided the ideal opportunity for our surveyor Joanne Lanham to officially capture and map the changes on the site. Read More

21
Mar
2017
0

How to map a new country?

Update: DVD released on 24 July 2017. We have one copy of the DVD to give away. Just retweet this message by 12 noon on Friday 28 July: https://twitter.com/OrdnanceSurvey/status/889486114536476674

March 24 sees the UK film release of Lost City of Z. It chronicles the South American adventures of British explorer, cartographer and archaeologist Lt Colonel Percy Fawcett. I joined a panel discussion in London last week, along with historian Dan Snow and Lost City of Z author David Grann, discussing how Percy would have explored and mapped a new land. Catch up on the podcast here.

Dan, David and Mark

A member of the Royal Geographical Society (RGS), Percy Fawcett first arrived in South American in 1906 to survey and map an area of jungle lying on the Brazil and Bolivian border. The border between the two countries was not fully mapped and it was agreed that an RGS survey and map would be accepted as an impartial representation of the border. Today we would complete this activity using satellite systems and sophisticated surveying technology, which obviously wasn’t available back then. So, how would Percy and his team have gone about making maps? Read More

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