calculate polygon area

[Mateusz Loskot]

On 7/18/06, Julien Bessiere <julien.63 at free.fr> wrote:
> So my questions is :
>
> 1- Does phpmapscript has a function to calculate area
> (something like distanceToPoint(pointObj poPoint))?

I have no idea.

>> 2- If no, how to calculate area wiht lat long coordinates?

You need to calculate area of spherical polygon.
Here you can find C code for this purpose

http://www.acm.org/pubs/tog/GraphicsGems/gemsiv/sph_poly.c

I hope you will be able to rewrite it to PHP.

Best regards
-- 
Mateusz Loskot
http://mateusz.loskot.net