Steve Bennett wrote:
Hi,
I was hoping to figure this out for myself but I can't. What's the
difference between lat and latp? I see a trigonemetric conversion
function, but what's the purpose?
lat is the raw latitude. latp is projected latitude.
In other words, latp->y co-ordinate is just a simple matter of
multiplication, just like lon->x co-ordinate (in the Mercator
projection, at any rate).
If you didn't project it then things would look squished and you
wouldn't be able to use tile backgrounds.
cheers
Richard
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