2 replies to this topic

[Arquiteto]

Hi everybody,

I am student of Maritime Academy in Gdynia, Poland. Our lecturer of navigation gave us a task to find as many adjectives describing map projection that can be seen on UN logo as it is possible. During the lecture he has also shown us a picture which compared 4 azimuthal projections: gnominic, stereographic, ortographic and perspective equidistant and said that the one on the UN flag is here. Now, here comes 2 questions:
1. Which one of them?
2. How it is possible to create azimuthal perspective azimuthal projection?

As for the first I think it is just azimuthal equidistant, because all others wouldn't let us see area from North Pole to 40 degrees south latitude.

About the second - I am nearly sure that it is mathematicly impossible to make such a projection, however I wouldn't like to face my lecturer (who is also a dean of faculty of navigation) without some evidence. What's more another professor from our school has written a book about navigation from which the picture comparing 4 projection was taken, so only two possibilities are: there really is such a projection or it was a misprint.
Misprint would be weird, because it is still in 3rd edition of book, printed in 2008, and as far as I know dean likes to ask this question to his students so it would be strange that nobody has spotted the mistake earlier.

So - If you could please give me some adjectives describing projection and check if there really is possibility to make equidistant perspective projection - I would be grateful.

[frax]

Hi and welcome! I think it might be polar stereographic in the UN seal. Here is another thread about that: http://www.cartotalk...?showtopic=4240

[dsl]

This site might answer your question about the Azimuthal perspective projection:

http://www.progonos....jAz/projAz.html

Cheers,
David