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ulas
Posts:
13
From:
istanbul
Registered:
7/17/08


Re: polygon creation from lat lon info
Posted:
Feb 15, 2009 11:28 AM


This polygon is in a Lambert Conformal projection. i ve the central lat lon and truelat 1 and 2 info of the projection. does this information help?
Ulas
Walter Roberson <roberson@hushmail.com> wrote in message <q1Xll.8946$nu6.8246@newsfe21.iad>... > 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.



