help: how do i messure this hill?
blablablacksheep
Posts: 1,377
there a hill i trying to messure and tryingto work out how steep it is:
i looked on multimap and using its OS mapping it gives the info.
but how the heck do i work out how steep it is,
bassically i know:
from the start of the hill the OS says 30, then the hill ends at 60. i understand maps but cannot for the life of me give a numbered reading for it.
heres the map link maybe you can help hopefilly:
http://www.multimap.com/maps/?fav=2#map ... dfavourite
any one know??
i looked on multimap and using its OS mapping it gives the info.
but how the heck do i work out how steep it is,
bassically i know:
from the start of the hill the OS says 30, then the hill ends at 60. i understand maps but cannot for the life of me give a numbered reading for it.
heres the map link maybe you can help hopefilly:
http://www.multimap.com/maps/?fav=2#map ... dfavourite
any one know??
London2Brighton Challange 100k!
http://www.justgiving.com/broxbourne-runners
http://www.justgiving.com/broxbourne-runners
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Comments
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hi,
Sorry if Im interpreting this wrong, but I gather the hill starts at an altitude of 30 (metres?) and finishes at 60, so to work out the gradient, find out the distance and then slot into this formula;
grade (steepness) = ( altitude gain / distance travelled ) x 1000 -
Or another way of doing it is to work it out as a ratio, rather than a percentage -
So your hill has an altitude gain of 30 metres from start to finish.
The next thing is to measure the distance between the start and finish points - for argument's sake, lets say it's 600 metres (just to make the maths easier...)
Now, expressed as a fraction, that's 30/600. If we divide the lot by 30, that gives us 1/20 - so your hill is a 1-in-20 gradient (i.e on average you gain 1 metre of altitude for every 20 metres travelled).
Peasy.
Of course, this only applies if the gradient is constant from start to finish - which it more often than not isn't.0 -
the thing was i wasnt sure if the map was metres i 99.99% sure OS maps are metres but the multimap site made me confused by having a bar underneeth saying;
= 500 yards.. so as you can see the easy part messuring distance wasnt as easy as you need to convert a bit.
can you confirm that dave is right about that formular?London2Brighton Challange 100k!
http://www.justgiving.com/broxbourne-runners0 -