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List:       qgis-user
Subject:    Re: [Qgis-user] Shifting a Geotiff image
From:       Michael Dufty via QGIS-User <qgis-user () lists ! osgeo ! org>
Date:       2023-08-14 5:56:24
Message-ID: SY6PR01MB750915B518579FF39FF9BD629C17A () SY6PR01MB7509 ! ausprd01 ! prod ! outlook ! com
[Download RAW message or body]

Good to hear that worked.  Last time I tried georeferencer on webodm output it didn't \
work (issue with images that already had CRS info).  Sounds like the problem may have \
been fixed. 1 to 2 m out does sound suspiciously like a GDA94 vs GDA2020 (current \
WGS84) issue, but probably just a coincidence.

From: QGIS-User <qgis-user-bounces@lists.osgeo.org> On Behalf Of Grant Boxer via \
                QGIS-User
Sent: Sunday, August 13, 2023 5:39 AM
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] QGIS-User Digest, Vol 210, Issue 10

Thanks Martin,

I ended up using the Georeferencer and the ground control point coordinates with a \
Helmert transformation. That worked well.

Cheers Grant


-----Original Message-----
From: QGIS-User <qgis-user-bounces@lists.osgeo.org> On Behalf Of \
                qgis-user-request@lists.osgeo.org
Sent: Sunday, August 13, 2023 3:00 AM
To: qgis-user@lists.osgeo.org
Subject: QGIS-User Digest, Vol 210, Issue 10

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Today's Topics:

   1. Re: Shifting a Geotiff image (Martin Weis)


----------------------------------------------------------------------

Message: 1
Date: Sat, 12 Aug 2023 18:17:51 +0200
From: Martin Weis <martin.weis.newsadress@gmx.de>
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Shifting a Geotiff image
Message-ID: <e8655a03-6fe6-0efd-ef1c-22ed7f9d50ff@gmx.de>
Content-Type: text/plain; charset=UTF-8; format=flowed

Dear Perth,

On 11/08/2023 09:14, Grant Boxer via QGIS-User wrote:
> I have a GeoTIFF image created using Web ODM and is mis-aligned by 1 
> to 1.5 m and I would like to move the image to register with the 
> surveyed ground control points. I can see vector tools to do this, but 
> no
raster tools.
> Anyone have any suggestions.


If it just a bit off, then the plugin "Freehand raster georeferencer"
can be quick to shift it, otherwise use georeferencer from core (Layer - \
georeferencer), which is especially more flexible and the right tool if you have GCPs \
that you can use. Be careful, sometimes crashes can occur with certain transformation \
types, so better save beforehand (autoSaver and MemoryLayerSaver are your friends).

> Image created in WGS84 z51S.

Sound like UTM (good, metric CRS), though WGS84 might be geographic CRS (worse, pixel \
size undefined/different in x,y).

Cheers
Martin





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