Benchmark locations

[JCB123]

Hi all - I'm trying to locate a benchmark in the immediate area of a site, but I'm damned if I can find a database or map with the benchmark locations on.....anyone got any ideas?

[normalbloke]

You just have to use the OS maps and be a little ingenious.What type is it?They are usually found on buildings or stone structures.However, there are a whole raft of newer types installed by the likes of the EA and are just small brass studs.

I'm sure someone will be along soon with a list of co-ordinates you can look them up by!

[JCB123]

I've looked on an OS Map where I know there is one, and it's not marked.

I'm now trying to find the closest one to my site and I cannot find a map with them identified on.

I found a website showing the brass plaque benchmark locations, but there aren't any within 3 miles of the site.

[DrTre]

http://www.bench-marks.org.uk/

any use?

[Tom_C76]

They've stopped maintaining the benchmarks now and removed them from some series of mapping. Most surveyors use kinematic gps to get the data instead I think.

[Steameh]

Havent spent much time surveying with what I do at Uni, but did a week long surveying course. Leveling from 3 miles would be a little tedious, especially since i was somehow 1.2 metres off over a closed loop of about 12 readings.

However, the total station we used for distance measurement was a cool piece of kit.

[normalbloke]

Steameh said:

Havent spent much time surveying with what I do at Uni, but did a week long surveying course. Leveling from 3 miles would be a little tedious, especially since i was somehow 1.2 metres off over a closed loop of about 12 readings.

However, the total station we used for distance measurement was a cool piece of kit.

Thats a huge error!

[JCB123]

I know benchmarks are now obsolete (sp?), but I cannot seem to find this information anywhere else.....as far as I'm concerned it should be public information, but everywhere I look you have to pay for it.

All I want to know is the level AOD of something near my site - how hard can it be?

[Trevelyan]

Not very hard as it happens. Took me about 30 seconds on google:

http://benchmarks.ordnancesurvey.co.uk/pls/htmldb/...

Type in the six figure grid reference (ie TL2020) in the box at the bottom and it'll tell you the nearest benchmark.

[JCB123]

Thanks - that's a great help...as it happens I was looking for something that wasn't there - the nearest benchmark is still over 3 miles away....

I'll just email hundreds of people until someone can just tell me what the levels are.

[Steameh]

normalbloke said:

Steameh said:

Havent spent much time surveying with what I do at Uni, but did a week long surveying course. Leveling from 3 miles would be a little tedious, especially since i was somehow 1.2 metres off over a closed loop of about 12 readings.

However, the total station we used for distance measurement was a cool piece of kit.

Thats a huge error!

Indeed it was, however my angles were all spot on so every cloud has a silver lining.

I blame the fact it was 5pm, in the middle of norfolk, in early march and it was bloody freezing.

Plus I never did get to grips with parallax.

[anonymous-user]

Be careful if you do find one! Saw a guy in Basingstoke who was doing some renovation work who took a wall down, remodeled and rebuilt! he put the benchmark back in a random place 'as a feature'!