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angryred

Joined:

Sep 07

Posts: 527

angryred says:

equivalent distance or height into miles....

on some walking websites I've noticed that they give an equivalent distance (being some calculation of height + horizontal mileage)

does anyone know how this is calculated and is there a standard?

or is it just to make you feel better at the end of the day?

or is it to help with route planning?

 
PaulH

Joined:

Feb 07

Posts: 577

PaulH says:

Re: equivalent distance or height into miles....

Probably basic Pythagoras & Trigonometry.

 

Or, it may be Naismith's Rule to claculate the time.
Then, if that time was on the flat what would the mileage be.

[This Reply has been modified by the Author]

HikerPunk

Joined:

Oct 07

Posts: 4642

HikerPunk says:

Re: equivalent distance or height into miles....

Dunno, sounds complicated to me. :blink::doubt:

Surely thats what Memory Map and the likes are for??!!:lol::lol::wink:

Oi oi n out!
BikerFool

Joined:

May 07

Posts: 6816

BikerFool says:

Re: equivalent distance or height into miles....

HP, I don't believe that the mapping software does do that, which is why I really don't think it worth the cost - what are computers for if they don't do the nasty sums?

If the pen and paper has to come out i might as well buy teh paper!

Life is not a rehearsal

Live it, love it

LostMe

Joined:

Sep 07

Posts: 1716

LostMe says:

Re: equivalent distance or height into miles....

Anybody who has digital maps and GPS soon realises how useful they are, the routes calculate elevation gain/loss when shown in the route profile, if they aren't calculating true distance, its not far out in my experience

If you are not ready to pay a certain price (cash not accepted), then it would probably be wiser to stay home.
Keith P

Joined:

Dec 07

Posts: 559

Keith P says:

Re: equivalent distance or height into miles....

on my Anquet mapping it shows the distance from pen y fan cairn to crybin cairn as just under a mile,,,,i can tell you its a damn sight further on the ground,,,,actual distance walked can be a lot further than you think,,and could cause problems of exhaustion at the end of a long day,,,,or running out of light,,,pays to study your map!!

Time is running out,,use it wisely!
julesandmissyg

Joined:

Feb 07

Posts: 892

Re: equivalent distance or height into miles....

Hi Keith P

I'd agree with you - I find the idea of GPS and mapping stuff slightly concerning because of the inaccuracies that seem to creep in. We do have a GPS unit (using it mostly as a glorified pedometer) but map, compass, the skills to use them and experience is still the best way to plan walks and accurately guage their time & distance based on what you know you can do given the terrain, conditions, etc.

If in doubt, walk.
PaulH

Joined:

Feb 07

Posts: 577

PaulH says:

Re: equivalent distance or height into miles....

Mapping Software uses the traditional tried & tested method of Naismiths rule to calculate journey time.
e.g. The "flat" mileage distance for given miles per hour hour, then just add an extra time per 100m of height gain.

You could, as I said, then work back and use the final time to find out how far you would have travelled in a straight line on the flat in the same time.

 

Mapping software does not provide a true distance.


That can be got by knowing horizontal map distance, height gained, and then apply basic right angle triangle Pythagoras to find the length travelled up a slope.
Or... height gain, angle of elevation, and apply basic Trigonometry.
(A mirror sighting compass, or a Theodolite, can do this... you still need to do the maths though!) .

BikerFool

Joined:

May 07

Posts: 6816

BikerFool says:

Re: equivalent distance or height into miles....

LOL :laugh:

Just had visions of me askin lil bro if I can borrow his precious theodolite to help calculate walk distance

:laugh::laugh::laugh::laugh::laugh:

Think I'll stick to paper and Naismith, though it is an interesting thought

Life is not a rehearsal

Live it, love it

Keith P

Joined:

Dec 07

Posts: 559

Keith P says:

Re: equivalent distance or height into miles....

hey BF,we'd all be going round like the two blokes in the film"the man who went up a hill,but came down a mountain"!!!!:lol::laugh:

Time is running out,,use it wisely!

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