# Curve and surface analysis

Hello,

If it is possible, in what way can it be defined in

module?JUniForm

Yes it is. Let the following points lying on a sphere

# Reiner Jäger, Tilman Müller, Heinz Saler, Rainer Schwäble: Klassische und robuste Ausgleichungsverfahren # 1. Auflage, 2005 # ISBN: 3-87907-370-8 # Kugelausgleichung S. 331f 1 14.551 9.495 8.433 2 9.071 5.002 10.892 3 12.865 4.306 8.775 4 9.170 7.898 11.930 5 9.993 9.575 11.745 6 12.152 6.017 11.054

If a sphere is fitted using JUniForm one obtain the following results:

The radius is about `r = 5 m`

. If the radius `r`

is known (with superordinate accuracy), it is possible to restrict the parameters. Let `r = 6 m`

be the known radius. To fix the parameter, go to *Properties --> Parameter*. Change the *Processing type* to *Fixing*, and the *Initial guess* to 6.

It is almost impossible to derive appropriate approximations, if user defined surfaces are defined. Therefore, you have to disable the option. Go to *Adjustment* --> *Least-squares* and uncheck the option *Derive initial guess*. (To get appropriate approximations, just fit the sphere without restriction beforehand, afterwards add the radius restriction as described above.)

The restricted results are

kind regards

Micha

--

applied-geodesy.org - *OpenSource* Least-Squares Adjustment Software for Geodetic Sciences

**Complete thread:**

- Curve and surface analysis -
**a2pac**, 2021-02-05, 08:10- Curve and surface analysis -
**Micha**, 2021-02-05, 09:56- Curve and surface analysis -
**a2pac**, 2021-02-16, 09:20- Curve and surface analysis -
**Micha**, 2021-02-16, 09:51- Curve and surface analysis -
**a2pac**, 2021-02-16, 10:42- Curve and surface analysis -
**Micha**, 2021-02-16, 11:38

- Curve and surface analysis -

- Curve and surface analysis -
- Curve and surface analysis -
**Micha**, 2021-02-22, 14:32

- Curve and surface analysis -

- Curve and surface analysis -

- Curve and surface analysis -