Altitude?
 

Does anyone have an Ordinance Survey map of the Bexleyheath area? I want to know exactly how high above sea level I am here. I have searched online and cannot find this info anywhere without paying for it :D

Re: Altitude?
 

Planning on diving in ?? :D

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lol......I've got a new watch and I'm trying to calibrate it.

Re: Altitude?
 

Re: Altitude?
 

men and gadgets. blimming expensive watch :Yikes:

Re: Altitude?
 

Isn't it already calibrated, at least suficiently accurately for your needs? Iv'e never heard of someone needing to recalibrate a peice of kit like that. Certainly I've got dive computers by Sunto, where depth is worked out entirely by pressure changes, and I've never heard of anyone worrying about calibration of them.

If your worrying about recalibration, that precisely, you'll need to know not only the height above sea level, but also the air pressure. I presume you've got a handy barometer, than you know is also properly calibrated, rather than relying on the watches version. After all if the altitude isn't set right, then how do you know the barometer bit is set correct?

Re: Altitude?
 

I found that, they will only sell you a map. I just want one bit of information from it so I don't want to buy it.It's got a barometer and temperature sensor built in :D
I need to know either the height above sea level or the exact atmos pressure to calibrate it. atm it thinks I'm at -43 metresMy Omega wasn't keeping time very well at all :mad: (I'm going to sell it) so Mandy allowed me off the leash :D

Re: Altitude?
 

Go to your nearest petrol station and have a butchers at one

Re: Altitude?
 

I know, I just thought I would be able to find the info somewhere online :(

Re: Altitude?
 

If you go to you're nearest 'old' bank or public building, there should be an OS 'Crow's Foot'. The line running paralell to the ground will give you the exact height above sea level, at that line. If in doubt where you can find this OS datum point, contact you're local Building Control Office and they will tell you where it is/ should be.

Hope this helps.

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rammy dad's going to have a look over at the school library after work. so won't be till about 6pm.... but he will see what he can find for you

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You could try looking up the height above sea level of various radio/tv transmitter aerials, and working backwards from there. I'm sure there must be one in the area. Haven't got time to search for a useful url tho'.

Re: Altitude?
 

Have a look at http://www.streetmap.co.uk/newmap.sr...rch.srf&dn=678

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Thames Barrier has an indicator on it, but most of London is at Sea Level ... How accurate do you need it to be ?

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Go to:
http://www.streetmap.co.uk/

and tap in your postcode. Then click on the third largest 'size' blob (the + and - arrows don't work properly). It's only from the OS 1:50,000 series but you should be able to work out your height.

Edit

That took me so long to type that Ian... beat me to it! :dozey:

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Based on the Streetmap thing, you are almost exactly over the 50m above line.

Re: Altitude?
 

I can't find any mention of altitude on that page :confused:

Re: Altitude?
 

There are contour lines on the map with the height above sea level somewhere along the line. On the map that I linked there is the 40 and 50 metre countour lines near the bottom left hand corner.

Height and Relief on OS maps.

There are two main ways of showing height on OS maps :

1. Contour Lines
2. Spot Heights

All points along a contour line are at the same height. On 1:50 000 and 1:25 000 maps, the lines go up in tens, and the 50 and 100 metre lines are in bold.

On OS maps, the tops of the numbers always point upslope, so you should know which way is up, even if you can only see one number (Note this is not always the case on black and white maps in exam papers - use your common sense)

Remember the closer the contour lines, the steeper the slope.

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Look for the feint orangey/browny contours.

Edit

Bugger, he's done it again :p: D'yer want to borrow my GPS Ramrod? :D

Re: Altitude?
 

Map1 ... without large arrow

Map2 ... with large arrow

;)

If you follow the 50m line ...... :D

Re: Altitude?
 

*cough*

Those images are Crown Copyright Nemmy!

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Oh yes.....I see the lines now :dunce: Cheers guys :)Ah but this is 'personal use' :D


...altimeter reset to +50 metres...thanks all :nworthy: :tu:

Re: Altitude?
 

Other less sensible options.

Book a flight on Easyjet, wait until you reached cruising altitude and set it to 7000 ft.

You could have gone to the river bank and set it to 0.

You could have hopped a train to Dover and set it to 0.

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Now run up Shooters Hill and see what it says!

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You forgot that the plane is pressurised :DI can see Shooters Hill from here but I ain't runnin up it :D

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No I didn't the plane is pressurised to 7000ft, cruising altitude is anything from 20 - 40k ft. So once at pressure you can safely set your watch to 7000 ft as that is where the cabin is pressurised to.

Neat link http://perso.wanadoo.fr/mirabilevisu/cpcs.htm

>>> Which is why you can never get a good cup of tea on a plane as the water boils at below 100 deg C, and why you get drunk quicker.

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Doh! Of course! :dunce:
This seems to be my 'stupid' thread :D

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Probably your local central library.

You know, li-brar-ee. Big building. Lots of books... Books! You know those things with pages with words prin-ted on them.

Yes, I'm sure is appallingly stone aged...!!


:jk:

Re: Altitude?
 

lol, I know that, it's just that I didn't have time to go to it :D