# block calculation on JAG3D

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?

## block calculation on JAG3D

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

"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

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

"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.

## block calculation on JAG3D

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