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BM Website Issues/Help Requests

biker match miles

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biker match miles

Posts: 28 Pages: 1/2

Kate5930
In: Birmingham
Posts: 96
Karma:

from my house to vmaxdegs its 14 miles but from vmaxdegs to mine its 9 miles how do you work that one out ? is it something to do with the camber of the road ? or how many right turns at islands ? Actually we have both clocked it and it is 16 miles ............ which ever way you go. Has anyone else noticed a discrepancy ? or how do you lose 5 miles ? with the price pf petrol could be a useful tip.

Kate5930 @ 01/10/2007 17:45

Sandi
In: Huddersfield, W
Posts: 17948
Karma:

Is this a trick question? Is it uphill to Deg's and downhill to yours?

Sandi @ 01/10/2007 17:51

vmaxdeg
In: COLESHILL
Posts: 58
Karma:

islands! what islands,i didn't see any

vmaxdeg @ 01/10/2007 17:57

Matt
In: Veldhoven
Posts: 8054
Karma:

hmmmmm. Damn. Let me figure it out. But for info the distance is calculated in a straight line

Matt @ 01/10/2007 18:09

Sandi
In: Huddersfield, W
Posts: 17948
Karma:

ROFLMHO @ Matt

Sandi @ 01/10/2007 18:17

Matt
In: Veldhoven
Posts: 8054
Karma:

You sure its saying that? I've checked the 2 postcodes you have, and they're pretty similar results (Allowing for a 10% error at either side due to the shape of the earth - makes it difficult to calculate). Here's my results for you.... The distance between these 2 postcodes is precisely 14.23317361 miles (To 8 decimal places).<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p> --------------------------------------------------------------------------------<o:p></o:p> The latitude distance between them is 13.26450232 miles (To 8 decimal places).<o:p></o:p> The longitude distance between them is 5.16102795 miles (To 8 decimal places).<o:p></o:p> Pythagorus theory (SquareRt of: X*X + Y*Y) is applied to find the distance...<o:p></o:p> SquareRt ( (5.2x5.2) + (13.3x13.3) ) = 14.23317361 miles.<o:p></o:p> <o:p> </o:p> <o:p> </o:p> The distance in reverse between these 2 postcodes is precisely 14.69078673 miles (To 8 decimal places).<o:p></o:p> --------------------------------------------------------------------------------<o:p></o:p> The latitude distance between them is -13.26450232 miles (To 8 decimal places).<o:p></o:p> The longitude distance between them is -6.31444321 miles (To 8 decimal places).<o:p></o:p> Pythagorus theory (SquareRt of: X*X + Y*Y) is applied to find the distance...<o:p></o:p> SquareRt ( (-6.3x-6.3) + (-13.3x-13.3) ) = 14.69078673 miles.

You sure its saying that? 
 
I've checked the 2 postcodes you have, and they're pretty similar results (Allowing for a 10% error at either side due to the shape of the earth - makes it difficult to calculate).
 
Here's my results for you....

The distance between these 2 postcodes is precisely 14.23317361 miles (To 8 decimal places).<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>
--------------------------------------------------------------------------------<o:p></o:p>
The latitude distance between them is 13.26450232 miles (To 8 decimal places).<o:p></o:p>
The longitude distance between them is 5.16102795 miles (To 8 decimal places).<o:p></o:p>
Pythagorus theory (SquareRt of: X*X + Y*Y) is applied to find the distance...<o:p></o:p>
SquareRt ( (5.2x5.2) + (13.3x13.3) ) = 14.23317361 miles.<o:p></o:p>
<o:p> </o:p>
<o:p> </o:p>
The distance in reverse between these 2 postcodes is precisely 14.69078673 miles (To 8 decimal places).<o:p></o:p>
--------------------------------------------------------------------------------<o:p></o:p>
The latitude distance between them is -13.26450232 miles (To 8 decimal places).<o:p></o:p>
The longitude distance between them is -6.31444321 miles (To 8 decimal places).<o:p></o:p>
Pythagorus theory (SquareRt of: X*X + Y*Y) is applied to find the distance...<o:p></o:p>
SquareRt ( (-6.3x-6.3) + (-13.3x-13.3) ) = 14.69078673 miles.

Matt @ 01/10/2007 18:23

Matt
In: Veldhoven
Posts: 8054
Karma:

hmmmm longitude distance is quite well out, tho it doesnt affect the result so much. The longitude is difficult to calculate, because its different distances (per one unit of messurement) at each point of the earth (Oval shape)

Matt @ 01/10/2007 18:27

Sandi
In: Huddersfield, W
Posts: 17948
Karma:

Aww bless Matt, you and your calculations, you're just a frustrated MATThematician aint ya

Sandi @ 01/10/2007 18:30

Matt
In: Veldhoven
Posts: 8054
Karma:

Check out how difficult it is just to calculate the earths radius... http://en.wikipedia.org/wiki/Earth_radius Nevermind calculate the distance between to units of messurement on that radius :-) Took me about 2 months writing the script that got within 1% accuracy. It's so complex that I wrote a full essay about it for college at the time.

Matt @ 01/10/2007 18:31

Matt
In: Veldhoven
Posts: 8054
Karma:

lol thx Kwak

Matt @ 01/10/2007 18:31

Oggy
In: Ely. Cambs
Posts: 2184
Karma:

Basicly you're saying it 14 miles Matt? I've noticed that on some profiles,say for instance,someone from Birmingham,it could say that they are closer to me than someone from Cambridge is Its fairly simple really,we can all tell the mileage calculator doesnt work very well & thats not a fault of the sites,commonsense should tell people to question it. p.s I've seen another site with a far worse calculator,Paris from Cambridge 4 miles!!!!???? lol

Oggy @ 01/10/2007 18:34

Oggy
In: Ely. Cambs
Posts: 2184
Karma:

Sorry that sounds a bit blunt really Knackered

Oggy @ 01/10/2007 18:35

Matt
In: Veldhoven
Posts: 8054
Karma:

hmmm, forget everything i just said (The results). My calculations may be wrong. Well, the calculations in my script are accurate (The methodolgy of calculating it) but the way I've implemented it is wrong. I've changed the value of a variable that I shouldn't have. Dammit.

Matt @ 01/10/2007 18:38

Matt
In: Veldhoven
Posts: 8054
Karma:

DAMN! It's the cosine thing. I work the longitude value out using the earth's radius. Simplified to cosinge(Postcode1's latitude value). BUT - its not accurate enough.

Matt @ 01/10/2007 18:48

Matt
In: Veldhoven
Posts: 8054
Karma:

Hmm ok, changed something which might fix it. It's actually 13 miles! LONGdifMile = LONGdifUnit * 2 * (4*Atn(1)) * cos(Postcode1_LAT) * 3956.545 /360 Changed to... LONGdifMile = (sin(LATdifUnit/2))^2 + cos(Postcode1_LAT) * cos(Postcode2_LAT) * (sin(LONGdifUnit/2))^2

Matt @ 01/10/2007 19:14

Matt
In: Veldhoven
Posts: 8054
Karma:

nope that doesn't work. ROchdale to scuunthorpe aint 3 miles! lol

Matt @ 01/10/2007 19:27

Cruiser gal
In: Tamworth
Posts: 2012
Karma:

When i rode to the Isle of Wight I did 10 miles more than someone else riding with me. I did 167 miles they did 157 was it because i rode slower so took longer to do them and he rode fast so his speedo struggled to record them all.

Cruiser gal @ 01/10/2007 19:34

skins
In: Sutton in Ashfie
Posts: 519
Karma:

I go to CG'S house every week and never can go the same way... she lives in the bermuda triangle....LOL

skins @ 01/10/2007 19:45

Sandi
In: Huddersfield, W
Posts: 17948
Karma:

I think Matt needs a holiday, or arresting! lol I hated Math's at school. Matt aka Carole Vorderman That's your excuse and you're sticking to it, eh Skins? You fellas always get lost, even with satnav

Sandi @ 01/10/2007 19:57

Matt
In: Veldhoven
Posts: 8054
Karma:

ok ok, think I've fixed it. Not implementing it everywhere just yet, but I'm testing it on the QUICK search page (Not the full search!). Go to www.bikermatch.co.uk (Homepage) And use the form there. Let me know if it works or not. It's now accurate to 0.01%!!!

Matt @ 01/10/2007 19:58

Posts: 28 Pages: 1/2

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