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I am a beginner using QGIS (1.8.0 Lisboa) on a Mac (OS X 10.6.8 Snow Leopard). I work on a file with two layers in the following sequence (top to bottom):

  • a vector polygon layer with a few outlines of various buildings in france and italy (CRS: EPSG:4326 - WGS 84 - "on the fly" re projection is activated )
  • a google satellite layer uploaded via open layer plugin.

Sometimes when changing the scale (scrolling in and out) the google layer updates a little wrong in size or position compared to the polygon layer. But as soon as I "pan" the map everything reconstructs right. Now the problem I have concerns the print composer.

The result of any kind of export - pdf, or image or svg - of my map (vektor layer + google layer in the background) differs from what is shown in the preview of the print composer: the vector layer and the google layer positions are mismatching and in a different scale. I can send some pictures showing screenshots of the print composer preview and the final results if required.

I tried almost everything:

  • new files with different CRS settings
  • "cache" update preview
  • "render" update preview
  • different paper sizes,
  • different scales,

The problem appears only using an open layer map (google, openstreetmap...). If I try the same using two vector layer (shapefile) - one with the buildings, another one with the city in background - everything works out great.

...exasperating! Since it is a real important research project I would be very grateful for some help and tips.

Thank you all in advance for the support.

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do you manage to solve this issue? I'm in the same condition, trying to overlay my data over bing aerial. I even tried 1.9.0 nightly build. I filed a bug here, no response in two weeks. Good luck! –  sanzoghenzo May 9 '13 at 20:56
    
this is an old thread, but i'm having the same problem with QGIS 2.2, running on iOS Maverick. I imagine it has something to do with on the fly correction? –  user29530 Apr 24 at 12:43

2 Answers 2

I can confirm this bug on 1.8, here are the related tickets: http://hub.qgis.org/issues/4223 and http://hub.qgis.org/issues/6653

Testing with today's master, I cannot reproduce the problem anymore. Everything seems to work fine.

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You can try http://mapproxy.org.

Mapproxy will make "open" layers available as a WMS server.

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1  
I'm not sure how this will solve the OP's issue. Could you add more information to this answer indicating the details? –  Devdatta Tengshe Mar 12 at 2:49

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