Hi Dion, QGIS has a georeferencer plugin for that purpose: see QGIS manual (http://download.osgeo.org/qgis/doc/manual/qgis-1.1.0_user_guide_en.pdf) - p. 122-125 - you need to know the coordinates of individual features (3-5 per map sheet) of the target coordinate system.
You have to register raster images individually though. The gdal_merge tool (command line) allows to later merge the files into a single file, once they are georeferenced. See: http://www.gdal.org/gdal_merge.html It shouldn't matter which operating system you choose. All should be equally well supported. Hope this helps to get started, Andreas On Mon, September 14, 2009 2:23 am, Houston, Dion A Sr CPT MIL USA TRADOC wrote: > Hi all, > > I apologize if this is a GIS 101 kind of question. I am slightly above > neophyte when it comes to GIS. > > I am trying to track down where some ancestors of mine lived. I recently > acquired JPG’s of old township maps showing my relatives from the > early-mid 1800’s. Of course these JPG’s aren’t geo-rectified, each > township is in a separate file, and they’re not necessarily north facing. > The also have limited features I can identify on modern maps, specifically > I was attempting to use hydrology, but there are now several reservoirs in > the area so much of the hydrology has changed. > > What I hope to do is to merge several township maps together basically > like a jigsaw puzzle and use churches to georectify. I downloaded QGIS > hoping it would be easy to do so, but it seems like raster layers are tied > together by coordinate system, so it puts the upper left corners of my > township maps together and doesn’t allow me to move them. > > If someone can tell me what tool(s) will do what I want, and/or how to do > it in QGIS I’d appreciate it. I am (as of this week) running a Mac with > Windows and Kubuntu running virtually so (practically) any operating > system will work. I am currently using GeoRect from FalconView to > georectify, but I noticed QGIS has that capability as well so I may try > that. My preference is to use free or cheap software, as I can’t justify > spending hundreds of dollars on Photoshop just to find some old ancestors > :) > > Thanks in advance, > > Dion > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user > -- Andreas Neumann http://www.carto.net/neumann/ http://www.svgopen.org/ _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user