[Qgis-user] Georeferencing for Avenza

[Stephane Goldstein]

Hi Peter.

I have been exporting georeferenced TIFs and using them in Avenza without
any issues so far, in both in GDA94 (lat/lon) and GDA MGA zones.
I always go trough the layout/composer and create a map covering the whole
page.
Then I export it as a TIF. The downside is you have to set a much higher
DPI then what you raster data is actually in, and the files get very big.
About 150mb for an A4 layout at 600dpi, which is what I usually use.
Of course this can vary depending on the extent of your map. The larger the
area you wanna load in Avenza, the higher your DPI setting needs to be.
I work with areas about 150x80km in one A4 layout.
Hope this helps.
Cheers.

On Tue, Oct 30, 2018 at 8:31 PM Kirk Schmidt <kirk at nortekresources.com>
wrote:

> 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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