On Wed, May 25, 2011 at 9:47 AM, Carlo Stonebanks < stonec.regis...@sympatico.ca> wrote:
> I need to calculate the long/lat values between a line demarcated by two > long/lat points. > > > > The points will be very close, but there is the 180 degree problem to > consider, so a simple average won’t work. > > > > Does anyone know of a function or have a formula that will work using geo > long/lat values? I don’t see anything obvious in the earthdistance module. > The simplest way to deal with "the 180 degree problem" is to remember that you can add 360 degrees to a long and get a value that should continue to work. So, assuming "West" is negative, -175 (175 degrees West) is the same as -175+360 = 185 (185 degrees East). Then you don't have to worry about wraparound. If the result is > 180, subtract 360. -- Rick Genter rick.gen...@gmail.com
