JGS = Java Geodesy Suite :] Now all we need to do is get Martin funding for the development of the new library. Is anyone on good terms with a US senator? If so, we might have a shot at getting the money put in the 900 billion dollar US stimulus package. :]
SS On Thu, Feb 5, 2009 at 9:41 AM, Paul Uszak <[email protected]> wrote: > Hi. > > I've discussed this issue before, and have found a couple of approximate ways > of doing distance calculations:- > > 1. Calculate a Vincenty Distance (equivalent to the DistanceSphere) - I can > let you have the code. This one is pretty accurate. > > 2. I have a reprojection algorythm that's more approximate, but will work for > any size of geometry. You will just have to accept that you can't draw an > sphere on a piece of paper and live with the approximation. I use > > X = 111230 * cosine(radians(latitude)) m /degree Longitude > Y = 111230 m /degree Latitude > > to reproject based on the lon /lat of the geometry's centroid. > > The driver for this requirement is when working with GPS systems > internationally. You can get into a real mess with regional datums. Best to > stick to lat /long. > _______________________________________________ > jts-devel mailing list > [email protected] > http://lists.refractions.net/mailman/listinfo/jts-devel > _______________________________________________ jts-devel mailing list [email protected] http://lists.refractions.net/mailman/listinfo/jts-devel
