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Author Topic: Vertical control points - no visible features  (Read 360 times)

j.senn

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Vertical control points - no visible features
« on: October 29, 2020, 12:59:12 PM »
Hi All,
my survey design contains a number of control points along a stream and thus unfortunately does not lock the model strong enough in the horizontal axis perpendicular to the stream. I.E. the model has a tendency to rotate slightly along the river axis.
Now there is a number of additional GNSS measurments available that were intended for the validation of the Z-accuracy of the DEM. Some are located beyond the control points and could extend the model. Unfortunately they are not related to visible features. Is there a way to include them as z-only control points?
Thanks for your help, it's much appreciated.
Johannes

Alexey Pasumansky

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Re: Vertical control points - no visible features
« Reply #1 on: November 01, 2020, 11:37:14 PM »
Hello Johannes,

You can use different weight for X, Y and Z values of the control points, for example, setting the marker accuracy as 1000/0.1 means that the XY coordinates are known with 1 km precision and Z - with 10 cm. Thus you can input approximate X and Y values for such points, since these values will be almost ignored due to the low accuracy.
Best regards,
Alexey Pasumansky,
Agisoft LLC