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Calculating distance using Latitude/Longitude

 
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Calculating distance using Latitude/Longitude
aNiXtEr
8 Feb, 2007 - 07:01 PM
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Here is the project I have been working on in VB.NET Class:
Great Circle Navigation

Do the necessary Internet research to find the equations that calculate the distance from one point on the Earth to another point given that the earth is round. Write a function that accepts coordinates in Longitude and Latitude and returns the distance.

On the internet find the locaton of several zip codes in coordinates to test. Document.

Download and install google earth (http://earth.google.com). Notice that the mouse pointer can be used to find the coordinates of a location. Test. You might try your house location, etc. Try to determine to accuracy (resolution) of Google Earth - document.

I am having trouble with the formula especially:
d=acos(sin(lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos(lon1-lon2))

any suggestions???
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Jayman
RE: Calculating Distance Using Latitude/Longitude
8 Feb, 2007 - 07:09 PM
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What seems to be the problem you are having with the forumula?

Converting it to something you can do in code?

You can do that by using Math.Sin, Math.Acos, Math.Cos.
CODE

d = Math.Acos(Math.Sin(lat1) * Math.Sin(lat2) + Math.Cos(lat1) * Math.Cos(lat2) * Math.Cos(lon1 - lon2))
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aNiXtEr
RE: Calculating Distance Using Latitude/Longitude
8 Feb, 2007 - 09:04 PM
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QUOTE(jayman9 @ 8 Feb, 2007 - 08:09 PM) *

What seems to be the problem you are having with the forumula?

Converting it to something you can do in code?

You can do that by using Math.Sin, Math.Acos, Math.Cos.
CODE

d = Math.Acos(Math.Sin(lat1) * Math.Sin(lat2) + Math.Cos(lat1) * Math.Cos(lat2) * Math.Cos(lon1 - lon2))



You have magical powers. Well sort of. The actual formula isn't hard. It was hard for me to grasp calculating the formula. But what i did, for those who are reading was to convert the degrees/mins to radians then put the decimal result into the formula then solve. Easy to solve, hard to start. Thanks for your help.
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