Hi Richard, For me this is an exercise in eliminating my dependence on Windows. In the past, I have done this by using MS Excel charts with the image as the background of a chart displaying my GPS plot. I set the X and Y (Longitude and Latitude) minimums and maximums for the chart to match the image and then compare my GPS trace with the underlying image. I want to do this with Linux and as Open Office Spreadsheet does not allow me to use an image as a background for a chart, I am looking for other (and better) solutions.
I am now looking at Quantum GIS and recognize it as a powerful tool. I have loaded in my image, reading the manual and struggling to find the "Raster Calculator" to which they refer in the manual. It appears that I can set the Latitude and Longitude bounds using the calculator. Still, I am running blind here but trying to keep hold of my original goal of loading the image as an underlay in JOSM to check my GPS trace. Thanks Richard, 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 12:55 PM, Richard Weait wrote: > On Sun, Jan 30, 2011 at 3:47 PM, 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. > It is possible that the map on the sign board is "artistic", rather > than accurate, so It might not even have a scale or projection. ;-) > > Now, getting ground control points right from a photo will also > involve compensating for lens distortion. So this might be a lot of > fun! > > _______________________________________________ > Talk-ca mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-ca >
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