[GRASS-user] Forwards and backwards RMS error in i.rectify (GRASS6.4.0RC3)

Aldo Clerici aldo.clerici at unipr.it
Mon Mar 16 09:55:41 EDT 2009

Dear GRASS users and developers, 

where can I find an explanation about the meaning of forwards and backwards
RMS error in i.rectify? They seem different from the x and y errors computed
and displayed in previous versions of GRASS. Are they two different
functions? In that case which is used to rectify the map?


Many thanks in advance.


Aldo Clerici

Earth Sciences Dep.

Parma University

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