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

[David Strip]

  
  
On 7/7/2021 3:47 PM, robertd...@tpg.com.au 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
robertd...@tpg.com.au 
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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Re: [Qgis-user] using georferenced PDF map files as layers

[Nyall Dawson]

On Thu, 8 Jul 2021 at 08:00,  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.

Make a temporary polygon layer and draw a polygon over the area of the
PDF layer you want to retain. Then from the Processing Toolbox run the
"Clip Raster by Mask Layer" algorithm to clip the pdf layer out to the
polygon's area only.

Nyall

>
> Keep up the good work folks.
>
>
>
> Kind regards,
>
> Robert M. Dare  OAM
>
> robertd...@tpg.com.au  Mob. 0428503385
>
>
>
>
> Virus-free. www.avg.com
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Re: [Qgis-user] using georferenced PDF map files as layers

[Ramon Andinach]

This is probably a rather crude approach, but. I’d probably convert the pdfs to 
an image (jpeg, tiff, etc) and combine them first. Then georeference the 
combined image.

Regards,
Ramon.

> On 8 Jul 2021, at 05:47,   
> 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
> robertd...@tpg.com.au   Mob. 0428503385
>  
> 
>  
> 
>  Virus-free. www.avg.com 
> 
>  
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> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user 
> 
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user 
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[Qgis-user] using georferenced PDF map files as layers

[robertdare]

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

robertd...@tpg.com.au    Mob. 0428503385

 



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