[Qgis-user] Shifting a Geotiff image

[Michael Dufty]

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 at lists.osgeo.org> On Behalf Of Grant Boxer via QGIS-User
Sent: Sunday, August 13, 2023 5:39 AM
To: qgis-user at 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 at lists.osgeo.org> On Behalf Of qgis-user-request at lists.osgeo.org
Sent: Sunday, August 13, 2023 3:00 AM
To: qgis-user at lists.osgeo.org
Subject: QGIS-User Digest, Vol 210, Issue 10

Send QGIS-User mailing list submissions to
	qgis-user at lists.osgeo.org

To subscribe or unsubscribe via the World Wide Web, visit
	https://lists.osgeo.org/mailman/listinfo/qgis-user
or, via email, send a message with subject or body 'help' to
	qgis-user-request at lists.osgeo.org

You can reach the person managing the list at
	qgis-user-owner at lists.osgeo.org

When replying, please edit your Subject line so it is more specific than
"Re: Contents of QGIS-User digest..."


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 at gmx.de>
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] Shifting a Geotiff image
Message-ID: <e8655a03-6fe6-0efd-ef1c-22ed7f9d50ff at 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





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

Subject: Digest Footer

_______________________________________________
QGIS-User mailing list
QGIS-User at lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user


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

End of QGIS-User Digest, Vol 210, Issue 10
******************************************

_______________________________________________
QGIS-User mailing list
QGIS-User at lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user