Sweet! Thanks Stuart. Now i can go back todo what i was doing :) qgis is a powerfull program, and the support developers are that of brilliant minds.
I still cant get qgis running on my computer, but i found that the problem is with my computer, and not the program. Hopefully you'll figure it out. cheers, Sam On 1/30/11, Peter Freeman <[email protected]> wrote: > Hi Stewart, > > Thanks! I have just installed Quantum GIS (I'm running Ubuntu 10.10) > and have loaded the JPEG as a raster file and am now learning how do do > what you suggested. > > Cheers, > > Peter > > Peter Freeman > 180 Musgrave Place > Salt Spring Island, V8K 1V5 > British Columbia, Canada > (250) 653-4623 > http://members.shaw.ca/petersfreeman > > On 11-01-30 11:24 AM, Stewart C. Russell wrote: >> Hi Peter, >> >> It's been a while since I hand-rolled a world file. If you can, install >> a recent version of QGis, as it has a truly excellent georeferencer. You >> click on control points on the bitmap, indicate the coordinates they >> represent in the real world, then set the system off transforming the map. >> >> >>> The map file is called map.jpg and I have created a world file called >>> map.wld >> I'd call that map.jgw, which is the convention for JPEG world files. >> (TIFF has tfw, PNG pgw, and so on.) >> >>> 100.0 >>> 0.0 >>> 0.0 >>> -100.0 >>> 103.5 >>> 1.5 >> Ooh, that can't be right. Lines 1 and 4 are units/pixel; if you're using >> geographic coordinates, that's 100°/pixel. This wants to be a small >> number. >> >> >>> Can you give me reasonably correct values for my world file? >> Lines 1 and 4 might want to be 0.01 and -0.01 respectively for 100 >> pixels/degree. >> >>> Do I need to create a projection file >> It helps, but these are even harder to produce by hand than world files. >> I think that QGis can produce them in the georeferencer. >> >> Stewart >> >> _______________________________________________ >> Talk-ca mailing list >> [email protected] >> http://lists.openstreetmap.org/listinfo/talk-ca >> > -- Twitter: @Acrosscanada Blogs: http://acrosscanadatrails.posterous.com/ http://Acrosscanadatrails.blogspot.com Facebook: http://www.facebook.com/sam.vekemans Skype: samvekemans IRC: irc://irc.oftc.net #osm-ca Canadian OSM channel (an open chat room) @Acrosscanadatrails _______________________________________________ Talk-ca mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-ca
