Derive drawing elements

The command Derive drawing elements (Derive from objects) derives DTM elevation points from drawing elements, which are then automatically saved as Point set get saved.

1. After calling the command you will be asked to select the corresponding objects in the drawing.
2. After making the selection with Enter or with the right mouse button, a dialog opens in which options for the leads can be defined.
   
3. On the tab selection in the field of Geometries you can set whether the points should be generated as control points and / or support points. The derivation of the bases is enabled by default. In addition, geometries can be derived dynamically. Under Points you can choose whether points (AutoCAD points and DATAflor DGM points) should be derived. The original points can be deleted as an option. In the area Other you can choose whether texts, blocks or DTM objects (contour lines, triangulations and grids) should also be derived. In addition, the Offset Define the distance from the derived text or block to the point symbol.
4. On the tab General one can Name and Info can be entered. Give the point set a distinctive description. This gives you a better overview if there are several sets of points. This name is also the default setting for all DTM follow-up objects. The properties for color, layer and visibility in the drawing can also be set here.
5. On the tab layout can you use the Point labeling define, as well as the number of decimal establish. This setting can be changed later.
6. With the confirmation [OK] the point set is created and inserted into the drawing.

Control points (Selection tab) means that an interval can be set in which height points on objects are removed (e.g. useful for digitized contour lines). The derivation of the control points always takes place in the processing, not in the projection. At Bases a derivation takes place via the pick points (linear objects) or from the base points (blocks and points). Either all support points can be derived or only the end points.

Control points: NO	Control points: YES

Will geometries dynamic derived, then you have the advantage that the derived points adapt as soon as the base object changes. In addition, when the triangulation is created, the triangles are rotated so that the derived geometry is displayed.

In addition, a selection area can be determined in order to derive points only in a certain area.

Point labeling (Layout tab): The points can also be assigned the coordinates of the current coordinate system (UCS coordinates) are labeled. The lettering is also used for Data exchange to Excel, into a ASCII- or CSV file exported. This function is used, for example, when setting out with the Leica Total station required.

The original CAD drawing objects remain unchanged after deriving with EXTRACT.

triangulation
Export of DTM data