[mapserver-users] World file creation

[Jeff Lake]

Maybe I'm not searching on the correct terms.
But what is the magic formula for creating world files ??

I have a map of the US with the following projection info
ullat=53.3638
ullon=-130.964
lrlat=18.2977
lrlon=-69.1058
sp1=0
sp2=39
cm=-95.5
rlat=36.5
width=640
height=480
projection=lambert

now how on earth do you figure the meter per pixel??
prefer php, but guess I could convert

-- 
-Jeff Lake
MichiganWxSystem.com
WeatherMichigan.net
TheWeatherCenter.net
GRLevelXStuff.com