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Resection
To determine the location of the total station occupation point by measuring known points.
To calculate the three dimensional resection, minimum two points with distance measurements are required. With angle-only measurements, three points are required. If additional points are measured, a least-squared solution is used.
To select the resection method and to configure resection settings, click
and select Options from the dialog menu. Selected method and configured settings retain between sessions. Currently selected resection method is shown in the dialog title.
The resection wizard helps you to perform the procedure:
- Specify the occupation point in the Define Instrument setup group.
- In the Occupy field, enter a name of the occupation point. If you determine the coordinates of an unknown occupation point, type in a new point name. If you want to recalculate the coordinates of the known occupation point choose the point either from the map
or from the list
.
- Set Code and attributes for the point:
- Select an existing Code from the drop-down list. You can manually type a code name. If there is no code with such name, the Code dialog will open when saving. There you can quickly create a new code with entered name.
- If the code type is Line or Area, the respective icon indicates that the point belongs to a line or area. Set a Code String and, if required, select an available Control Code (single or dual) from the drop-down list.
- Click the Code
button to access more code and attribute parameters in the Point Attributes dialog.
- In the HI field, enter the height of the instrument.
- In the Scale field, specify the scale factor for the occupation point. (This setting is available when User Defined is selected in the Scale Factor field in the Resection Options dialog.) Click
and select the scale factor for the occupation point. Available choices depend on the Coordinate System, Coordinate Type, and Localization that are used in the job. The asterisk (*) will be added to the scale value, if you have updated the initial value of the Scale field.
Note: The Scale setting is unavailable if WGS84 coordinate type is set in the Display dialog. The Scale setting is locked to Grid to Ground if the transformation to ground coordinates is enabled in the Coordinate System dialog.
- Click the Next button to continue.
- Specify and measure known points.
Several dialog views are available to perform multiple known points measurements: The Resection: Normal view is used to specify a known point to measure and the Resection: Map view provides visual control over available points locations. The Resection: Results view is used to review performed measurements results and to calculate the resection. Use the view selector in the dialog title bar to switch between views at any time.
- In the Resection: Normal view, specify the known Point. Enter a point name manually, or select from the map
or from the list
of job points.
Note: If you have entered a new point name, the software will prompt you to manually enter this point coordinates in the Add Point dialog.
-
With the help of the Use H and Use V check boxes, specify whether the control point should be used for horizontal and / or for vertical resection calculation:
- If only Use H is selected: the control point will be used for horizontal calculation only. Note that this option is disabled when selected point has no horizontal coordinates.
- If only Use V is selected: the control point will be used for vertical calculation only. Note that this option is disabled when selected point has no elevation (i.e., is a 2D point).
- If both Use H and Use V are selected: the control point will be used both for horizontal and vertical calculation.
Note: By combining Use H and Use V filters, a user can group the control points to calculate horizontal coordinates only (
Use H /
Use V) and separately group the control points to calculate height only (
Use H /
Use V). In this way, the 3D coordinates of an occupation point are calculated right in the Resection dialog, without sequential calculating in the Resection and then in the Benchmark dialogs.
- The Code field displays the selected point's code.
- Enter the height of the target. Type the value manually or click the button with current target icon to select one of the previously used values from the context menu. Select Edit from the context menu to open the Targets dialog to add or modify target configurations.
- Take measurement in Resection: Normal or Resection: Map dialog view. More...
- When you have measured sufficient resection points, the Resection: Results view opens. To continue measuring more control points, click there the Add button to return to Resection: Normal view and repeat the procedure for the remaining known points.
- When you have measured sufficient resection points, the Find button becomes available next to the Point field. After a known point name is specified, click Find to open the Find Resection Point dialog. In this dialog:
- The Turn To angle values are displayed, giving you the direction to the selected point.
- The Right/Left: Rod to TS check box sets the vector to indicate right / left directions: Rod to TS when checked
, TS to Rod when cleared
.
- For robotic total stations, there is also the To point button to force the instrument to automatically turn to the selected point.
- To review, manage and accept the results of performed measurements on a number of known points, use the controls provided in the Resection: Results dialog view.
Note: Read more information on performing Resection in Hybrid Positioning™ Mode where TS and GNSS measurements are used simultaneously.
Click the EDM button in the dialog's title bar to open the associated drop-down menu with a set of total station functions and parameters that are frequently used and changed during field work.
Click
in the dialog's title bar to review and modify the survey settings. More...
Click
to open the dialog menu with additional options:
To review commands and options available in the Resection dialog pop-up menu:
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