Author Topic: Number of GCPs  (Read 2197 times)


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Number of GCPs
« on: October 10, 2014, 11:48:37 AM »
Hi all,

I would like to create a very accurate DEM from aerial photos. I have a question regarding the number of ground control points. I would say more GCPs would lead to a more accurate DEM. Am I right?

From the Agisoft Photoscan manual:
In case of aerial photography and demand to fulfil georeferencing task, even spread of ground control
points (GCPs) (at least 10 across the area to be reconstructed) is required to achieve results of highest
quality, both in terms of the geometrical precision and georeferencing accuracy. Yet, Agisoft PhotoScan
is able to complete the reconstruction and georeferencing tasks without GCPs, too.

I am curious about the number of GCPs people use and how large the reconstructed area is? I would like to get a number of GCPs needed per squared (kilo)metre for example.


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Re: Number of GCPs
« Reply #1 on: October 12, 2014, 11:25:29 PM »
« Last Edit: October 13, 2014, 01:20:06 AM by stihl »