Re: [Qgis-user] using georferenced PDF map files as layers

Wed, 07 Jul 2021 20:36:48 -0700

On 7/7/2021 3:47 PM, [email protected] wrote:

Hi,  I have the latest ver. of QGIS, I have imported two georeferenced PDF maps but need to delete the boarders and legends to stitch the two into one map while retaining the georef. Data for use in Avenza.  Cannot find in the excellent docs and tutorials. Can anyone advise please.

Keep up the good work folks.

 

Kind regards,

Robert M. Dare  OAM

[email protected]  Mob. 0428503385

 

Some georeferenced PDFs (for example, from QGIS) are vector representations that maintain the layer structure. If that's the case, you likely can turn off the borders and legend. Many more, however, are just a wrapper around a raster image, in which case all you can do is clip the layer to remove the elements you don't want.

You mention that your target is Avenza. I will point out that by the time a user downloads your map from the Avenza store, it has been rasterized, so you may as well rasterize it in QGIS and just upload a geotiff. In addition, I've had problems with Avenza's handling of pattern fills as simple as diagonal hashes, so I ended up exporting as a geotiff for that reason. And finally, QGIS geo-pdfs can't represent transparency in layers styles, so that too will push you towards a tiff export.


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