How to convert a DTM BRK digital terrain model to a CAD DXF file
With this program it is very easy.
Open the .BRK file and simply select the XYZ BRK format, look at the preview (points only) and then click on OK.
In the above dialog you can see we have chosen X Y Z .BRK as the format, and 3D as the coordinate system. Note also that we start reading at row 7, because the first 6 rows are comments (as you can see in the panel at bottom left).
Now since .BRK files have been designed to contain multiple polylines you must tell Pointor to use that system when creating the DXF file. That too is easy, simply click on the DXF Options button above (or in the options menu) and choose "Polylines with breaks" as the lines option, as shown below.