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Finding bench marks query #829858
6th Oct 2013 12:41pm
6th Oct 2013 12:41pm
Joined: Oct 2008
Posts: 5,143
Birkenhead
derekdwc Online content OP
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derekdwc  Online Content OP
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Birkenhead
Bench marks are points in the real world where the latitude and longitude (and usually the elevation) are recorded to a very, very high accuracy and precision. In the real world, these are marked by small brass discs set in concrete (or bedrock) that include certain information on them. Bench marks are necessary for accurate surveying by providing well-established starting points for measures and triangulation.

bench mark database

types of bench marks

Does anyone know where this one is?
Bidston
FB Rock outcrop NW face of living rock, SE side of Hoylake Road
328560 390270
Grid ref SJ28569027


Are the bm on this map bench marks?


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bench marks on maps.jpg (313 downloads)
Last edited by derekdwc; 6th Oct 2013 12:43pm.
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Re: Finding bench marks query [Re: derekdwc] #829871
6th Oct 2013 2:39pm
6th Oct 2013 2:39pm
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Cheshire
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yoller Online content
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yoller  Online Content
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Cheshire
Junction of Boundary Road and Bidston Village Road, according to the coordinates.

Last edited by yoller; 6th Oct 2013 2:43pm.
Re: Finding bench marks query [Re: derekdwc] #829872
6th Oct 2013 2:46pm
6th Oct 2013 2:46pm

P
Pinzgauer
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P


The "BM" followed by the height above datum ie. "BM 27.6" are indeed bench marks Derek. Can't check the grid.ref as I don't have a decent scale map OS map of the area, but.... "living rock" ? Could it be on the sandstone rock face near a certain set of tunnels/air raid shelters on Hoylake Road? From memory, that's the only exposed "living rock" around that neck of the woods.

Re: Finding bench marks query [Re: derekdwc] #829922
6th Oct 2013 7:34pm
6th Oct 2013 7:34pm
Joined: Nov 2009
Posts: 37
Great Sutton
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Papa_Juliet Offline
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Papa_Juliet  Offline
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Great Sutton
Those co-ordinates in Google Streetview take you here:

SJ28569027

Which is Bidston Village Road near the junction of Boundary Road.
If you look along the wall to the right you can see what looks like the benchmark just above the rock where the sandstone wall starts.





Re: Finding bench marks query [Re: derekdwc] #829941
6th Oct 2013 8:43pm
6th Oct 2013 8:43pm
Joined: Dec 2009
Posts: 92
birkenhead
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nuddy Offline
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nuddy  Offline
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birkenhead
Fascinating, I never knew these existed,
here's one on Hilbre Island,

clicky

and another in Liverpool

clicky

Re: Finding bench marks query [Re: nuddy] #830255
8th Oct 2013 6:42pm
8th Oct 2013 6:42pm
Joined: Jun 2009
Posts: 311
Oxton
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OxtonHill Offline
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OxtonHill  Offline
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Oxton
The Bidston Bench Mark.

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P1140414.JPG (151 downloads)
Re: Finding bench marks query [Re: derekdwc] #830809
11th Oct 2013 10:49am
11th Oct 2013 10:49am
Joined: Oct 2008
Posts: 5,143
Birkenhead
derekdwc Online content OP
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derekdwc  Online Content OP
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Birkenhead
Wherever it had B.M on a map would there have been a real life marker (a plate, rivet etc)?
I find it more interesting now looking at maps and seeing the heights (above sealevel?)
I tend to think of most roads as on the same level unless I see a visible slope
eg
Main park entrance to the church at top of Oxton Road

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main park entrance.jpg (71 downloads)
park rd s.jpg (71 downloads)
Oxton bm.jpg (71 downloads)

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