[mapserver-users] World file creation

[Brent Fraser]

Jeff,

   World files use projected x/y coordinates.  Use the Proj4 library 
functions (in Mapscript)  to project the upper left and lower right 
spherical lon/lat coordinates to x/y, then use the image size (length, 
width)  to calculate the values for the world file 
(http://en.wikipedia.org/wiki/World_file)

Best Regards,
Brent Fraser

On 7/3/2012 8:27 PM, Jeff Lake wrote:
> 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
>