[Qgis-psc] How to apply a correction to inaccurate contour elevations

[Giovanni Manghi]

Dear David, good afternoon,

This mailing list is not for support. You need to write to the users
mailing list

https://qgis.org/resources/support/#communication-channels

or look for community support using one of the other communication channels:

https://qgis.org/resources/support/#communication-channels

You may also want to consider getting some commercial support:

https://qgis.org/resources/support/commercial-support/

there are  plenty of companies around that can help you in a professional
and timely manner.

With regards


On Sat, Jul 19, 2025 at 3:27 PM David Brownrigg via QGIS-PSC <
qgis-psc at lists.osgeo.org> wrote:

> I have a dsm made by WebODM from a drone image set with inaccurate gps.
> Contours made from the dsm have a +45cm error compared to known vales.
>
> In Raster->extract->contour I tried setting 'Set offset from zero' to -0.45
> BUT resulting contours have the same numerical values as before.
>
> What should I be doing (e,g for a contour labelled 10.50 to be labelled
> 10.05 in my case)?
> Thanks in advance for any help.
> David
> _______________________________________________
> QGIS-PSC mailing list
> QGIS-PSC at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/qgis-psc
>


-- 
Giovanni Manghi
https://naturalgis.pt/ <http://naturalgis.pt/>
giovanni.manghi at naturalgis.pt
* QGIS/PostGIS Training
* QGIS Support and Consulting

--
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-psc/attachments/20250719/193bcabd/attachment.htm>