Input data

The approximate coordinates on the network points, measured horizontal directions, measured horizontal distances and their mean errors (hereinafter only geometric quantities) serve As input data in the adjustment. We suppose that the geometric quantities are converted to the connecting line between the stabilization marks. This conversion can be done using the GROMA system tools.

Switching on/off the items

In front of each item on the list, a check box is displayed which can be used to temporarily turn on/off the data without the need to remove it from the list and eventually add it back on.

In some cases, the program can automatically turn off the useless items. Particularly in these cases:

  • Points where no measurement was performed.

  • Measurements which were performed on the points which are not listed on the point list.

  • Measured directions on the station which contain only one measurement.

Approximate coordinates of the entry points

For all the points included in the net, the approximate coordinates must be entered. You can enter the approximate coordinates manually, drag them from the coordinate list from the GROMA program (e.g. from the previous adjustment, from the previous phase), or you can let the system batch calculate the approximate coordinates on the basis of the measured data list.

Dragging the coordinates from the GROMA program

Of you want to use the coordinates which you already have on some coordinate list in the GROMA program as the approximate coordinates, you can simply select and drag them as a block to the part of the dialog window for network adjusting, where you enter the approximate coordinates (see the manual for the GROMA program: Dragging items). All the points are automatically dragged on the coordinate list.

Important

In this way, added points will have all the features set in the feature list before dragging the block. If you want to change the features for some points, you can either perform the change later, or you can drag the points in parts and set the required features before dragging the pertinent point.

Batch calculation of the approximate coordinates

If the approximate coordinates of the network points are not available, you can allow the program to batch calculate them. You have to follow certain steps to perform the batch calculation correctly:

  1. Open all the coordinate lists in the GROMA program which you need for the batch calculation.

  2. Open the measured data list wherefrom you want to calculate the approximate coordinates.

  3. On the measured data list, mark all the measurements which shall enter in the adjustment as orientations. The measurement to the points marked as detailed are ignored.

  4. In Settings->Environment, turn on the option Sear in all opened files.

  5. Drag the name of the entrance measurement file into the dialog window for network adjusting (in the part for entering the approximate coordinates of the points). The filename will be in the item Input measurement file.

  6. In the list of point features, (Type) set the feature which will have the majority of the points in the net.

  7. In Settings->Network parameters set the mean error of the measured direction and the measured distance.

  8. Press the button (Load data).

The program will batch calculate the coordinates of all the stations from the measured data lists, add them to the list of the approximate coordinates, and at the same time, the program will add all the measurements which could be used for the network adjustment to the list of the measured directions and distances. The detail points on the measured data list will be skipped. If the program adds some measurement which shouldn't be used for the calculation to the measured data list, or if you want to add some more measurements, you have to perform the changes manually by adding or removing the individual item.

After uploading the batches, change the point features (permanently marked points, free points, etc.). The batch editing of the point features is described in the chapter on Points features.

The program uses the batch polar method from the GROMA program for the calculation of the point coordinates. During the calculation, it can process the polar method, free station and intersection from the oriented directions. Before starting the calculation, the coordinates of at least the most necessary points, from which can be induced the other points according to the measured data, must be available. The batch calculation can fail for some configurations (e.g. only the distance-measured triangle strings, or if there was no measurement between the known points). In such case, you can use the individual calculation jobs of the GROMA system for the calculation of the approximate coordinates.

Important

If some distances in the network were measured in both directions, you have to first process the measurement list to contain only one average value. No geometric quantity can appear in the input data for the network adjustment more than once. You can use the command Measurement->Field book processing of the GROMA system to process the measured data list.

Measured directions list

Enter all the directions you want to use for network adjusting to the measured directions list. Just as for the approximate coordinates, the directions can be entered either from a keyboard or dragged form the measurement list; you can also let the program batch add them (see Approximate coordinates of the entry points). A mean error estimate must be entered for each measured direction. When dragging or batch calculating, the program will add the direction mean error set in Settings->Network parameters.

Measured distances list

Enter all the distances you want to use for the network adjustment to the measured distances list. Just as for the approximate coordinates, you can enter the distances from the keyboard, drag them form the measurement list, or let the program batch add them (see Approximate coordinates of the entry points). A mean error estimate must be entered for each measured distance. When dragging or batch calculating, the program will add the distance mean error set in Settings->Network parameters.

The program presumes that the entered distances are horizontal and have already undergone the required mathematical and physical reductions.

Measured vertical elevations list

Enter all the vertical elevations between the network points which you want to use for the network adjustment on the measured vertical elevations list. Just as for the other data, you can enter the vertical elevation from the keyboard, drag them from the measurement list, or let the program to batch add tem (see Approximate coordinates of the entry point). An approximate length must be entered for each measured vertical elevation wherefrom the weight for the adjustment is derived. If you don't enter the length, the program will determine it before the calculation from the approximate coordinates. You must set the unit mean error of the vertical elevation in the network parameters settings, and choose how the weight of the individual elevations shall be calculated. The weight can be calculated from the formula

pi = 1/si,

or

pi = m0/si2

where pi is the weight of the vertical elevation, m0 is the unit mean error, and si is the distance in kilometers.

Warning

The program presumes that the input elevation is recalculated to the connection of the stabilization marks (i.e. adjusted by the instrument height and signal). This adjustment can be performed during the field book processing directly in the GROMA system.