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| From | Nick Cox <n.j.cox@durham.ac.uk> |
| To | "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |
| Subject | st: RE: reverse vincenty |
| Date | Wed, 6 Oct 2010 11:41:25 +0100 |
H Wright is presumably asking about commands, not functions. There is no inbuilt function in Stata (or Mata) for this calculation. A user-written Mata function should be perfectly doable. Also, -vincenty- is a user-written command from SSC (Austin Nichols). But I don't know of any such code. Nick n.j.cox@durham.ac.uk H Wright I have been using the vincenty function to calculate distances between latitudes and longitudes. I would now like to find points that are X miles from a given coordinate. Is anyone aware of a function that would calculate a latitude of a new point if all other inputs are know? For example : vincenty 41.75499 -124.194 ? -124.194, hav(5) So I want to know the latitude of the point 5 miles away on the same longitude? I looked at the code in the vincenty ado file and it is beyond my mathematical ability to calculate this number myself. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/