[Qgis-user] Georeferencing for Avenza

[Gmail - Peter]

Hi Kirk

 

Some of the earlier posts from a few years back also pointed out the need
for the World File also, so I have been enabling that wherever I see that as
an option.  When exporting as a pdf it is not produced, even though ticked,
although when exporting as a tiff rather than a pdf, it is produced, and
looks to be produced correctly.  An export Option box pops up where you can
set the resolution, crop to extent, tick a box to generate a world file and
enable antialiasing. 

The tif file produced is referenced, but weirdly. When the map (a Perth
local one as a trial) is imported into Avenza, it states that the image is
on map, but when the locate icon is engaged, you are not on the map.  When
you use the Measure tools in Acrobat reader, the geospatial Lats and Longs
are completely random.

 

I can't see it as being anything other than a bug at this point.

 

Regards

Peter

 

From: Kirk Schmidt [mailto:kirk at nortekresources.com] 
Sent: Tuesday, 30 October 2018 8:32 PM
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Georeferencing for Avenza

 

Hi Peter:

Generate the map you require in the field using the print composer.  In the
items window on the right hand side of the standard composer window, select
the Composition Tab and check the save world file option in the export
settings.   

Save the pdf of the map and load into Avenza.  

 

Kirk

 

On 10/30/2018 7:39 AM, Gmail - Peter wrote:

Dear List Subscribers

 

Are there any updates to the threads of 2015/2016 regarding QGIS producing
georeferenced tifs or pdfs for loading into Avenza?  I am a newbie to QGIS
(Madeira 3.4) and while I have succeeded in producing a correctly
georeferenced tif file via Raster>Conversion>translate, this only works on
one layer.  The three other methods I can see to export or print a pdf or
tif do not produce a correctly georeferenced file in Lats/Longs using
GDA94Z50.  The file according to Avenza is ~54deg and 89deg south and west
of where it should be.

 

I am starting with a non-georeferenced raster which I put through the
georeferencer with 6 GCPs and several experiments of transformation types,
settling on polynomial 1.  The process produces a tif, pdf, and loads back
into the main window.  The main window raster is georeferenced perfectly, so
wouldn't you think the other output would be too?

 

The correct method should be to use Print Layout, produce a map with all the
layers from the main window, and export as an image or pdf.  This might work
if the map units were real world and not mm.

The fall back should be Project>Import/Export>Export Map to Image or pdf
from the main window, but that doesn't work either.

 

I hope the solution is obvious and I have overlooked something simple.  Any
guidance appreciated, I like to take my maps out into the field.

 

Regards

Peter






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-- 
Kirk Schmidt, MScF, BScF, RPF
General Manager
Nortek Resource Solutions Inc.
RR # 1
Thorburn, NS
B0K 1W0
Tel (902) 922.3607
Email: kirk at nortekresources.com
Web: www.nortekresources.com
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