# block calculation on JAG3D

by **Leslie**, Friday, April 13, 2018, 13:20 (11 days ago)

Hello,

I have questions about group compensation for JAG3D, more precisely on **block calculation**.

Is it possible on JAG3D?

I would like to know how it works.

In fact I have two theodolites and I would like to calculate them together.

I also have 4 common references to the two theodolites with a new point in common.

Would it take several common sensors or not?

Thank you in advance for your answers!

## block calculation on JAG3D

by **Micha** , Friday, April 13, 2018, 13:51 (11 days ago) @ Leslie

Hello Leslie,

I have questions about group compensation for JAG3D, more precisely on

block calculation.

I'm sorry, but I don't know the term *block calculation*. Can you explain the term?

In fact I have two theodolites and I would like to calculate them together.

Okay, you have to import the observation data from both instruments. Moreover, you have to import/define (approximation) coordinates of the reference points and the new point.

/Micha

--

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

## block calculation on JAG3D

by **Leslie**, Friday, April 13, 2018, 14:16 (11 days ago) @ Micha

*"I'm sorry, but I don't know the term block calculation. Can you explain the term?"*

Bulk calculation is to perform a calculation for several theodolites with common sensors that will stabilize the topographic network and allow a better determination of the coordinates of all the sensors.

*"Okay, you have to import the observation data from both instruments. Moreover, you have to import/define (approximation) coordinates of the reference points and the new point."*

I tried this, but I have very high ellipses of trusts.

I do not know if it comes from my observations or common sensors.

## block calculation on JAG3D

by **Micha** , Friday, April 13, 2018, 14:38 (11 days ago) @ Leslie

Hello,

Bulk calculation is to perform a calculation for several theodolites

So, it is just the combination of sensors during the adjustment process, isn't it?

I tried this, but I have very high ellipses of trusts.

Maybe, you have a wrong configuration, i.e. you haven't divided the directions into separat groups (each group represents a set of directions that has one unknown orientation). Maybe, your stochastic model is not correct. Maybe, there are some outliers... etc.

/Micha

--

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

## block calculation on JAG3D

by **Leslie**, Friday, April 13, 2018, 15:06 (11 days ago) @ Micha

*"So, it is just the combination of sensors during the adjustment process, isn't it?" *

yes, it is.

*"Maybe, you have a wrong configuration, i.e. you haven't divided the directions into separat groups (each group represents a set of directions that has one unknown orientation). Maybe, your stochastic model is not correct. Maybe, there are some outliers... etc."*

Maybe.

Thanks for your answer !

## block calculation on JAG3D

by **Micha** , Friday, April 13, 2018, 15:14 (11 days ago) @ Leslie

Hello,

Maybe.

I'm sorry, but without any data, nobody will give you a *right* answer.

regards

Micha

--

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