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Session Check
Before the residuals calculating for the Survey Sessions you need to have a number of sessions in the current job with corresponding data collected.
MAGNET Field calculates residuals for repeated measurements of the same physical point. The measurements should be performed in the same or different sessions. The physical point should be named identically in each session.
Note: You can save two and more points with the same name in the current job, if you select the Store as check point? radio button in the Point Check dialog. MAGNET Field performs the comparison with the last check measured and saved point of the selected session.
Note: You can see all check points for a point in the Check Points tab of the Edit Point dialog.
To perform the residuals calculation of Survey Sessions:
- Set the data needed for the task in the Input tab of the Session Check dialog. More...
- Select the computation type and calculate the task. More...
- Review the results of calculation. More...
Input Sessions
In the first Input tab, specify the calculation parameters:
- Select the Computation Type from the drop-down menu:
- Closure - performs loop closures calculation for the RTK GNSS observations that form a closed loop. More...
- Duplicate Vector - performs comparison of repeated RTK vector components, measured from one base station. More...
- Duplicate Coordinates - performs comparison of RTK points coordinates measured from one base station in the horizontal plane. More...
- Check Two Coordinates - calculates residuals of horizontal distances between control points and RTK measured points. More...
- Check Cross Section - this computation type calculates residuals of two repeated measurements of distances between a central point of the X-section and any other point of the X-section. MAGNET Field calculates the distance measurements residuals in the horizontal and vertical planes. More...
- Check Control Points - calculates residuals of horizontal and vertical distances between control points and RTK measured points. More...
- Check Two Sessions - performs comparison of repeated RTK vector components, measured from one or two base stations and saved in two sessions. More...
- Check Topo Meas - performs comparison of RTK points coordinates measured from one base station command to the receiver. More.... This Computation Type is shown if you open the Session Check dialog from the pop-up menu of the Topo dialog (Measure -> Check Calculation).
MAGNET Field calculates residuals of repeated RTK measurements in geocentric coordinate system (X,Y,Z) regardless of the current coordinate system of the job. Depending on the selected computation type, MAGNET Field displays in report and saves residuals of repeated RTK measurements in the following coordinate systems:
- Cartesian topocentric coordinate system. For N,E coordinates such a coordinate system is equivalent to the orthographic projection. A user can select any measured point of the job as the center (origin point) of this projection:
Transformation to such coordinate system is performed for Closure and Duplicate Vector types of computations.
To calculate residuals in the topocentric coordinate system you should specify central point of the projection in the Origin Point field of the Input dialog. Select a desired point from the map (click
) or from the list of the job points (click
).
- Coordinate system that is based on the stereographic projection with origin point placed in the location of the base station. If the job contains multiple base stations, the stereographic projection origin is placed in the point, which coordinates are averaged of all base stations coordinates used in the first selected session of the Input tab:

Transformation to such coordinate system is performed for Duplicate Coordinates, Check Cross Section, Check Two Coordinates, Check Control Points, Check Two Sessions and Check Topo Meas types of computations.
- The tab contains the following columns:
- Session - name of the session with the check box. If the check box is selected, this session is used in the calculation;
- Job - name of the job, where this session is located;
- Status - the calculation status of the session;
- Base Pt - name of the base station which is used in the RTK measurement;
- Type - type of correction data that is used for survey.
- Select the check boxes near the desired sessions to include them into the calculation.
- Click the From Job button to open the Open Job dialog where you can select a job which contains a corresponding session for residuals calculation. When the job is opened, the desired session is displayed in the tab.
- Click Next.
Input Reference Data
In the second Input tab, specify the reference data for calculation:
- Set the Tolerances for the data used in the calculation. The content of the fields on this dialog depends on the selected computation type. You can use predefined types for tolerances from the drop-down list available after selecting the Use Predefined Types check box.
- Select the Reference Point from the map
or the list
for Closure, Duplicate Vector types of computations. More....
- Click the Calculate button.
Results
In the tab, review the results of the calculation:
- Status
- the status mark is green, if the coordinate difference for the selected points is less than the corresponding Tolerance values,
- the status mark is red, if the coordinate difference for the identical points is greater than the corresponding Tolerance values.
- Point name, coordinate or distance differences for the selected points, name of the Base point(s) and session number(s).
Click the
button to save the calculation results to *.txt or GNSS-Pro(*.DLF) file format.
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