[Qgis-user] World File for map compositions

[pcreso at pcreso.com]

Hi Markus,

If you choose "File -> Save as Image", then save as a PNG, for example, the on screen image is saved, along with the world file allowing it to be reused.

Note that the file suffix pngw will be used, not wld or pgw for the world file.

However, I'm not aware of this being directly supported from the map composer, but there are a couple of ways of doing this that might work for you.

You could use the georeferencing tool to generate a world file from a saved map composer image, but this can be a bit fiddly, although a useful exercise for students in its own right.. 

You could also use an image processing tool to convert a composer image to the same pixel geometry as a saved map window, in which case the world file would also apply to it, or perhaps double the x & y pixel counts (for better resolution) and halve the pixel offset values in the world file. For this to work you'd need to have all the map composer elements overlaying the actual map (if this is possible), rather than outside the map, and therefore extending the apparent image extent.

Cheers

Brent Wood

--- On Sun, 8/14/11, Markus Weidenbach <landconsult at freenet.de> wrote:

From: Markus Weidenbach <landconsult at freenet.de>
Subject: [Qgis-user] World File for map compositions
To: qgis-user at lists.osgeo.org
Date: Sunday, August 14, 2011, 6:57 AM


  

    
  Dear list,

    

    is there a way to save a world file together with an image of a
    completely designed map in the map composer?

    The idea is to provide less experienced GIS users with a
    geo-referenced raster image (or pdf) of a complex map composition
    including an explaining legend, scale bar, north arrow and
    pre-defined layers in a specific order and layout. Such an image
    could easily be used by GIS beginners to visualize complex thematic
    issues and even add further layers or do some area/length
    measurements.

    Any hints and ideas how this could be managed are welcome.

    

    Regards,

    

    Markus

    

    -- 

      Dr. Markus Weidenbach 

      landConsult.de
      

      Geographical Information Management
      

      and Environmental Planning
      

      D-77773 Schenkenzell
      

      Germany
      

      e.mail see: http://landConsult.de
  

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