(This functionality is available
with the Input / Output module)
Exports data to Leica Machine Guidance System D45 format.
Refer also to the Export dialog box topic.
This format uses design point and alignment data to create an ASCII file suitable for use in the Leica Machine Guidance System.
Leica Machine Guidance System (D45 Format) dialog box
| Item | Used to |
| Alignment: | Select the primary alignment to use as a reference from the drop down list. Alternatively snap to the primary alignment that you want to use. |
| Start Chainage / Distance: | Enter the start chainage or distance depending upon the current alignment configuration. Alternatively you can snap to the starting point along the alignment. The default is to the start of the alignment. |
| End Chainage / Distance: | Enter the end chainage or distance depending upon the current alignment configuration. Alternatively you can snap to the ending point along the alignment. The default is to the end of the alignment. |
| Distance Range: | Enter the distance range either side of the section marker in which to look for points that are to be exported. |
| Minimum Offset: | Enter the minimum offset from which to search for data. Negative to the left of the alignment, positive to the right. |
| Maximum Offset: | Enter the maximum offset to search for data. Negative to the left of the alignment, positive to the right. |
| OK | Validates the input data and creates the D45 file. |
| Cancel | Closes the dialog box without creating a D45 file. |
Cross section offset sets are collected at each section marker between the start and end chainages selected and sorted in the order of minimum to maximum offset. The first offset set is taken as containing the correct number of points. Subsequent sets are compared and if the number of points in any set is different, a note is placed in the exported file with an appropriate error message.
The D45 data file created is also checked for the condition that two adjacent points may not be closer than 2 cm.
If this condition is not met, an appropriate error message is placed in the 'D45' file created.
If an error occurs, the user is informed and can immediately view the created data file to ascertain the cause of the errors. Each error is tagged with '>>>' so as to make it easy to search for just the errors in large data files.
The following is the typical process to create the D45 format file.
- Import the data. (Typically from a DXF or a DGN file)
- Filter the data.
- Model the data and visually inspect it to ensure there are no incorrect elevations.
- Create the alignment. The data is usually strung linearly along the project with straight lines and therefore this is simply achieved by creating the alignment by trace.
- Create the section markers (usually by selecting key points only).
- Create the D45 format file. (often this will require the user to edit the data to achieve the required results - the most typical problems are duplicate points that have not meet the previous filtering criteria or section markers that are so close together that several points within adjacent cross-section sets fall into both sets.)
- After the data is created without errors, it is imported back into LISCAD
(all strung) to ensure that all the points are all in the correct order.
The method for importing back in is:
- Set the DEFAULT code to Stringable. To do this select Utilities/Tables/Code Table/Open, uncheck Table View, and then press OK. Select DEFAULT from the dropdown Code list, check Stringable on, and press Update.
- Import/ Survey and Cad Systems and choose User Definable (*.asc) as the file type.
- In the File name field type "*.d45" and press enter, this will show all d45 files in the current folder.
- Select the file needed and import it as a space separated ASCII file.
This again is a simple visual inspection. The resultant string should appear as an unbroken 'saw-tooth'.