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Re: polygon creation from lat lon info
Posted:
Feb 15, 2009 11:04 AM


ulas im wrote:
> i am trying to create a polygon from four corners that i ve the lat lon info of. > the object is to create the polygon first and then check if a number of > points fall inside the polygon.
Which geoid model? http://en.wikipedia.org/wiki/Geoid
Do you have access to the symbolic toolbox? If not, then you will only be able to run the calculations approximately, and you are going to get the wrong answers for some points, especially if the polygon is extremely close to or straddles the North Pole or South Pole.
Yes, the implication of my questions *is* that in order to solve this problem, you *must* take into account the curvature of the Earth. Latitude and Longitude are spherical measures, so the calculation of what is "inside" or "outside" must be done in spherical space.



