World Files - Defining Image Rotation

[Ed McNierney]

David -

I just read Flavio's note and I think the equations in the article he
indicates should be very helpful!

	- Ed

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
Behalf Of Flavio Hendry
Sent: Saturday, December 22, 2007 3:32 AM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] World Files - Defining Image Rotation

Hi David

maybe this helps:
http://en.wikipedia.org/wiki/World_file

Mit freundlichem Gruss / Best Regards
Flavio Hendry

----------------------------------------------------------------
TYDAC Web-Site:  http://www.tydac.ch
TYDAC MapServer: http://www.mapserver.ch
----------------------------------------------------------------
############      Mit freundlichen Gruessen / Kind Regards
############             mailto:flavio at tydac.ch
############         TYDAC AG - http://www.tydac.ch
####    ####        Geographic Information Solutions
####    ####         Luternauweg 12 -- CH-3006 Bern
############   Tel +41 (0)31 368 0180 - Fax +41 (0)31 368 1860
----------------------------------------------------------------


-----Original Message-----
From: "Fawcett, David" <David.Fawcett at STATE.MN.US>
To: MAPSERVER-USERS at LISTS.UMN.EDU
Date: Fri, 21 Dec 2007 23:34:36 -0600
Subject: [UMN_MAPSERVER-USERS] World Files - Defining Image Rotation

> After spending a lot of time with my friend Google, I have come to
> the conclusion that documentation on how to calculate the rotation
> parameters of a world file is very hard to find.  
> 
> I have an image that I would like to georeference and rotate using a
> world file.  If I want to rotate the image 43 degrees
> counter-clockwise, how do I go about calculating the rotation
> parameters in the world file?  
> 
> Here are the params that I have already determined
> 
> 0.177959962	pixel size x direction
>                 rotation x term
> 	        rotation y term
> 0.177941345	pixel size y direction
> 583930.6469	ul xcoord
> 4895626.67	ul ycoord
> 
> Thanks, 
> 
> David.