Elevation correction

Hello everyone,
I’m sorry if this is a simple question.
I have made some models with my drone photo’s using webODM. When I put them in Qgis, arcgis pro and arcmap they are properly georeferenced. However, the elevation is very off, by about 100 meters. Does anyone know how I can correct this?

Greetings, Matis
Sorry if I happen

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You can use the raster calculator, in QGis at least.

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GCPs are made for this, if you have the time and ability to collect them!

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