I've used the georeferencer a number of times without difficulty (1.7.0, Windows) on a number of occasions, but I've run into difficulties a couple of times as described below. I'm trying to georeference a BMP (4804 x 3084 pixels) using four points, linear nearest neighbour transform and EPSG:27700. The message at the bottom of the screen says "Transform:Linear Translation (399639, 182204) Scale (2.10238e-06, 2.14539e-06) Rotation: 0 Mean error: 1.82928e+06". The points file contains: mapX,mapY,pixelX,pixelY,enable 399725.746871799987275,182064.111945799988462,40058150.943396233022213,-1346 0679.245283015072346,1 399773.490492700017057,182058.143993200006662,62315320.754716999828815,-1767 9358.490566037595272,1 399756.519127400009893,182072.939542400010396,54779886.792452841997147,-1017 3018.867924522608519,1 399763.668237300007604,182090.781233999994583,58678528.301886811852455,-1997 509.433962255716324,1 The mapX/Y values seem sensible, but the pixelX/Y values are far too large... and shouldn't they be integers? It generates the following world file: 0.000002109413289 0 0 -0.000002133093642 399641.036519734247122 182094.590552107954863 The raster loads but is about 10mm wide rather than about 200m. I'm not sure exactly why certain images are a problem, but am starting to wonder if it is linked to trying to transform into a relatively small target area. Has anyone else seen this type of problem or is there anyone who can suggest where I may be going wrong... or should I just file a bug report?
Andrew Chapman _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer