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???
06/14/06 10:42
Modified:
  06/14/06 10:49
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 		 #118270 - haversine formula
Responding to: ???'s previous message
If you assume that the Earth is spherical which it is for all practical purposes then you can use the Haversine formula
Given the the earths radius R is approximatly 6,371 Kms
deltaLat = lat2-lat1
deltaLong = long2-long1

a = sin²(deltaLat/2) + cos(lat1)cos(lat2)sin²(deltaLong/2)
c = 2atan2(√a, √(1−a))
great Circle distance is R*c
So that will give the distance as the crow flies between two points assuming that crows fly in straight lines.
you can also use the spherical law of cosines but its not very good for small distances.



List of 32 messages in thread
TopicAuthorDate
Calculating accurate Distance b/w            01/01/70 00:00      
   Nothing to do with Keil?            01/01/70 00:00      
      Keil-specific            01/01/70 00:00      
         Of course, but does that not mean that t            01/01/70 00:00      
            Eternities.            01/01/70 00:00      
               maybe differencial gps            01/01/70 00:00      
                  If it is differential gps ...            01/01/70 00:00      
               actually, it's just a ruse            01/01/70 00:00      
                  You Cynic!            01/01/70 00:00      
                     I guess you're right, Andy            01/01/70 00:00      
   haversine formula            01/01/70 00:00      
      I think the problem isn't the formula ..            01/01/70 00:00      
         basically stuffed            01/01/70 00:00      
   Over what range?            01/01/70 00:00      
   Cross-posting            01/01/70 00:00      
   So what was the big panic, then?            01/01/70 00:00      
      Clearly........            01/01/70 00:00      
         is that a problem?            01/01/70 00:00      
            Nooooo eric.            01/01/70 00:00      
               well, you often seem to be wound up enou            01/01/70 00:00      
                  it's the coffee, doncha know ...            01/01/70 00:00      
                     its the morons who want impossible thing            01/01/70 00:00      
            Good humor!!            01/01/70 00:00      
         and he does that because it works            01/01/70 00:00      
         Yet to be solved!!!            01/01/70 00:00      
            Write your own library!            01/01/70 00:00      
               Fixed-point math            01/01/70 00:00      
            Specification!            01/01/70 00:00      
               Maths            01/01/70 00:00      
                  shooting sparrows with RPGs and shooting            01/01/70 00:00      
                     Someone's being misled            01/01/70 00:00      
                     On double precision floating point            01/01/70 00:00      

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