Calculation Project Settings

In the first calculation step, you specify the calculation parameters as shown in the following table.

Note:

You can modify the settings at any stage of the calculation. However, then you must start again with calculation step 3, Find Reference Points.

Calculation Project settings	Description
Calculation Project Name	Specifies the unique name.
Calculation Project Description	Describes the calculation project.
Options	To set the adjustment type and distance reduction. Click to display all options.
Reduce Distance	Selects whether distance reduction is applied.
Height For Reduction	For distance reduction, and if no heights are calculated, specifies the average height of the survey area. In the Global Settings, use the Category 1 for large units to specify the display unit. See also Unit Settings.
Reduction	Mandatory. Specifies the reference system, and the reduction algorithm. Click to display all options.
Module	For distance reduction, selects the reduction algorithm. Select Universal Reduction, to use one a coordinate system supported by AutoCAD Map 3D. Select Specific Reduction, to use a specific algorithm. Then, the system will check whether the spatial area of the document matches the selected reference frame.
Reference Frame	Selects the reference frame for the distance reduction. If Universal Reduction is selected, the list displays the default coordinate systems of Map 3D. If Specific Reduction is selected, the list displays reference frames that have been modified to meet local requirements.
Description	Displays a description of the selected reference frame. For the universal reference frames, also displays the well-known text description (WKT).
Advanced Options	Advanced options control the adjustment calculation process. Click to display all options. When you click Next, the system checks for invalid and missing input.
Maximal Norm. Residual (Wi) Threshold	Specifies the maximal value for the normalized residuals Wi. Enter a value from 0-20. See also Normalized Residuals Wi.
Maximal Numbers Of Iterations	Specifies the number of iterations that will be performed to improve the approximate coordinates in step 7, Calculate Adjustment. Enter a value between 0 and 20. Normally the results of the first approximation calculation is sufficient.
Maximal Coordinate Increase	For coordinate transformation, that means to process coordinate observations. Specifies the maximum coordinate increase between two iterations. Enter a value between 0 and 1. The unit corresponds to the length unit that is used in the database.
Error Second Type	Specifies the probability of an error of second type in [%]. The value is used to calculate the Nabla values. Enter a value between 0 and 100. Nabla is the largest undetectable error of an observation.
Minimum Chi Square Test Threshold	Specifies the minimum value that determines a successful Chi Square test. See Chi-Square Test.
Refraction Coefficient	Specifies the refraction coefficient.
Standard Refraction Coefficient	Specifies the standard deviation (0-0.5).
Approximate Orientation Threshold	For tachymeter processing, specifies the upper limit for the standard deviation of a station orientation. If this limit is exceeded, no approximate coordinates can be determined for the station in step 4, Calculate Approximation.
One Side Vertical Factor	Specifies a factor that is used to calculate the a priori standard deviation of one-sided vertical angle observations. Enter a value between 0 and 5.
Minimum Reliability (Zi) Threshold	Specifies the minimum value for the local reliability. See Local Reliability Zi.