Orientation of sets

In some tasks (e.g. polar method, intersection from directions, free station, transit traverse), it is necessary to perform the orientation of the set of horizontal direction. The orientation method is always the same, regardless of the task.

You can proceed in two ways: You can fill in the orientations individually or you can let the program orient the set automatically.

Manual orientation of the sets

First, enter the coordinates of the station into the area for station input using the point numbers or dragging with the mouse (doesn't apply for free station - in such task the coordinates of the station will be established).

Enter the necessary data on the pertinent orientation direction in the area for the axis orientation (the measured distance is not required, it is used only for control purposes), and press the button (Add). The orientation will be added to the list and the program will recalculate the entire orientation of the directions set. If there are more orientations than one on the list, the program will display the adjustments on the individual orientation directions. Fill in all the orientations you want to use in the same way.

Automatic orientation of sets

If you want the program to automatically perform the orientation of a set, drag only the station number (red data on the measured data list) into the area for the axis orientation. From all the directions measured at the station, the program will select only those where the coordinates of the target are known and will add them automatically to the list of orientations. Therefore, before the automatic orientation of the direction set, it is necessary to have opened the coordinate list containing the coordinates of the station and orientation points. In addition, a method of searching the points must be selected so the program is able to find the pertinent points on the lists (the coordinates must be in the active coordinate list, or the search must be allowed in all opened lists).

In this way, the created list of orientations can be further edited (you can add, remove or adjust items). The data can be add using the button (Add), and removed by the button (Remove).

If you want to remove some direction from the orientations, but not completely (in case you want to use it later), you can turn it off by checking the box in front of the point number. The turned off direction will remain on the list for further use (with displayed corrections), but will not be used for the orientation of the set (it won't appear in the report).

If you want to adjust one of the items, point at it on the list of orientations to display the values in the editing windows, and then adjust the values. Add the adjusted value and remove the original, non-adjusted item.

Orientations weight

When orienting the set, you can merge the weights of the individual directions in the calculation. The weights can be set in the program configuration (Settings->Calculations). You can choose from three standard settings:

  • 1

    Weights of all the measured directions are 1. This calculation was used in the previous versions of the GROMA system.

  • 1/s

    For the individual directions, the weights calculated from the relation

    p = 1/s

    are used where s is distance to the orientation point.

  • s/1000

    For the individual directions the weights determined from the relation

    p = s/1000

    are used where s is distance to the orientation point.

  • User settings

    Besides these three predefined options, in the input line for the weight can be written any function containing the parameter s.

Note

When selecting a predefined weights, notice how changes the function for the weight calculation in the input box.

The number values of the individual weights can be found in the report on orientation of the set of directions.