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:[EMAIL PROTECTED] ############ 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" <[EMAIL PROTECTED]> To: MAPSERVER-USERS@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.