FT3 Mercator Projection

peleliu

Testing out my newly installed FT3 (3.0.12) (upgraded from FTpro) and came across an error with the Mercator projection. The top and bottom edges seem to go on to infinity. No problems with other projections that I have noticed. Any idea what is going on?

Any help would be appreciated.

jslayton

http://en.wikipedia.org/wiki/Mercator_projection

The mercator projection goes to infinity at the poles. You just normally see a cropped version to allow printers to make smaller sheets than "infinitely large".

peleliu

Thanks for the info. I just thought FT would crop maps to usable areas.

jslayton

It does, to some extent. That is, it tries to fit the map horizontally and cut off the areas that are outside the window.

There are other infinite-extent projections in FT and they all suffer from the problem of where to set the default zoom. I tried to balance the usable area against being faithful to the projection extents, but I'm not sure I did a good job in all cases.