On 10/16/2011 02:26 PM, Gerhardus Geldenhuis wrote: > On Sun, Oct 16, 2011 at 10:03 PM, Alex Mandel > <[email protected]>wrote: > >> On 10/16/2011 01:32 PM, Gerhardus Geldenhuis wrote: >> Just to check, do you have projection on-the-fly turned on? For best >> image quality the image needs to be in it's native projection. Though in >> this case it sounds like you just opened the image file to look at it. >> How does it look in something like GIMP when you zoom in? >> > > Hi Alex > Many thanks for the reply! > > No idea if I have project on-the-fly turned on, I could not see any > reference to it in the project properties or options. > Native projection? I scanned the paper images and the scanner saved them as > jpeg files. I then opened up the images in The Gimp rotated and aligned the > to a drawing grid in Gimp because they were about 1 degree skewed. I > had pencilled lines on the paper that represented UTM grid lines. I saved > these as both jpg and png format both in lowest compression thus highest > quality. Viewing either the jpg or png file in Gimp or Image Viewer is fine > and if I zoom in to 1:1 scale the quality is perfect. > > Redo that, and try to get a tiff or png from your scanner. Also there is no need to manually rotate the image as georeferencing will take care of that. The fewer saves/conversion along the process the better.
You probably do not have on-the-fly on since it's off by default. >> >>> Second question is how can I "align" this png file with with an actual >>> co-ordinate system. I have marked 4 points on my paper maps and lines >>> between these points that represent the UTM grid on which I worked and I >>> would need to at least roughly align this image with the UTM grid. >>> >> >> Georeferencing plugin, this will turn your tiff into a GeoTiff, the same >> as what you might get from preprocessed ASTER data. You can mark and >> enter known coordinate locations and then warp the image to fit. >> > > That sounds excellent I am going to try that now. > > >> >>> Thirdly I am not sure how to draw on a new layer but still view my image >> as >>> a template for the digitizing. >>> >>> I am more than happy to read any documentation and work through >> tutorials. >>> What is lacking at the moment is the terminology to search for the >> correct >>> things and experience. I am working through a number of tutorials but are >>> still struggling a bit to connect A to B. >>> >> Read the manual on the QGIS website, create a new vector layer and >> editing it can be over anything else you have loaded in the map view. >> http://qgis.org/en/documentation/manuals.html >> >>> I will eventually add some ASTER imagery but it is my understanding that >>> these are in tiff format and contains extra information like spatial >>> referencing. I suspect that if I can master the above then adding ASTER >>> imagery will be easy. >>> >>> Lastly is there any geological map symbol databases available? >>> >> It's been discussed and some work has been done on it but nothing >> comprehensive yet. If you have Images or Fonts of the symbols you want >> you can easily convert them for use in QGIS. >> >> > A shame, I have send of an email to the British Geological Survey and see > what they come back with. I might have access to the ArcGIS and could load > the images database provided by the US Geological Survey. Not sure if ArcGIS > would allow me to export it into something more usable. My google results > turned up an email thread which suggested that there was some work done on > supporting gdb files... > > Regards > ESRI icons are all fonts, and can be converted using fontforge to svg. Though I don't know anything about the licensing. We are trying to work on more open sets, a preliminary list of things that might help is here: http://wiki.osgeo.org/wiki/OSGeo_map_symbol_set The USGS symbols are available but need to be cut on and converted using GIMP/Inkscape if you want scalable svg. Thanks, Alex _______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
