[GRASS-user] Orthorectifying images

[katrin eggert]

Greetings

I have just received a task to Orthorectify very-high resolution images. I
know that GRASS (LINUX) performs this (I have never tested) but my question
is more "basic" and elementar: Does anyone has a link or a document that
explains:
1- Required preprocessing before Orthorectification
2- How to do a Orthorectification
3- Relation between Error and DEM spatial resolution

Thanks
Kat
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