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Posted by Kim Skatun on May 25, 2011 at 9:20am

I am trying to write up a code using the known GPS position to caluate the distance to a given point>

long distance = dist2Point(long latitudeOfPoint,long longitudeOfPoint)

and also distance to a given line which goes between to GPS points>

long distance2Line = dist2Point(long latitudeOfPointStart,long longitudeOfPointStart, long latitudeOfPointEnd,long longitudeOfPointEnd)

any ideas how to do this by using snippets of existing code?

Thanks for all ideas

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gps, wgs84

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Tom Yochum May 26, 2011 at 7:58am

I find this site full of useful info.

Calculate distance and bearing between two Latitude/Longitude points using haversine formula in Jav…
Developer

Michael Oborne May 25, 2011 at 5:15pm

long get_distance(struct Location *loc1, struct Location *loc2)
{
if(loc1->lat == 0 || loc1->lng == 0)
  return -1;
if(loc2->lat == 0 || loc2->lng == 0)
  return -1;
float dlat   = (float)(loc2->lat - loc1->lat);
float dlong  = ((float)(loc2->lng - loc1->lng)) * scaleLongDown;
return sqrt(sq(dlat) + sq(dlong)) * .01113195;
}

taken from navigation.pde