Raster layer - Howto? {Scanned}

[Siki Zoltan]

Hi Pascal,

A world file contains the six parameters of an affine transformation like

x1 = Ax + By + C
y1 = Dx + Ey + F

All parameters are in separate rows in A, D, B, E, C, F order

example:
0.15   (A) pixel size in nature in x direction (e.g. 15 cm resolution)
0.0    (D) depends on rotational angle, afaik it must be zero for mapserver
0.0    (B) same as above
-0.15  (E) negative pixel size in nature in y direction
1234.56 (C) x position of the center of the pixel at upper-left corner 
4567.89 (F) y position of the center of the pixel at upper-left corner

Zoltan

On Thu, 1 Nov 2007, Pascal Ehlert wrote:

> Gregor Mosheh wrote:
>> I don't have a world file handy at the moment, but it only took me about 5 
>> minutes to learn it for the first time. Name the worldfile 
>> land_shallow_topo_8192.tfw and gdalinfo will automagically detect it and 
>> suddenly change its tone. :)
>
> Sorry, apparently I'm not as clever as you are.. ;-)
> I'm totally new to the GIS sector and thus don't really understand the terms 
> used there and the techniques behind.
>
> Would you (or someone else, of course) mind giving me an example world file 
> with a few comments, so that I can understand it?
> Unfortunately I couldn't find such an example on the web.
>
>
> Thank you again.
>
>
> Pascal