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Height Point

The object „Height Point“ is used - besides the object „Contour Line Point“ - to model the topography resp. the terrain‘s profile.

Note that when modeling terrain by using height points - in contrast to contour lines and lines of fault - a screening effect will just result from the triangulated terrain edges generated between the height points. This requires that the option „Triangulation“ in the dialog Calculation| Configuration, tab "DTM" (see DTM Digital Terrain Model Tab), is selected and the option „Explicit Edges Only“ is deactivated.


Terrain model just made of height points, option „Explicit Edges Only“ deactivated
Result: A shielding effect by triangulated terrain edges occurs.
Terrain model just made of height points, option „Explicit Edges Only“ activated
Result: No screening effect occurs.

By using height points a defined height above the reference plane is assigned. The height is specified according to the geometry of point-like objects. The absolute height of objects having been entered using relative heights is calculated using the ground height resulting from the terrain model.

Dialog Height Point

Dialog options

Name, ID, Memo-Window, ObjectTree

see Dialog Options Name, ID, INFO, ObjectTree, Master in the manual „Introduction to CadnaA“

x (m), y (m)

coordinates of the height point in the selected coordinate system

Height z (m)

absolute height of the height point

Button „--> RefPoint“

see Further Input Features, Filling the List of Reference Points

Use Contour line as Cluster of Height Points

Many height points require a large amount of memory and, thus, increase the size of the project file (also due to the fact that for each height point the name and the ID have to be stored separately). To save memory you may convert the height points into contour lines using the command Modify Objects (action „Convert to“, object type „Height Points“). This action generates a cluster of height points where each cluster may consist of up to 1000 height points joined to a contour line. The contour lines can be converted back again into individual height points.

Example

Path: Examples\Topography\HP.cna

  • Open the file HP.cna containing about 4,000 height points.
  • Open the dialog Modify Objects, selected the action „Convert to“ for object type „Height Point“ and confirm by OK.
  • On the dialog Convert Objects select the target object type „Contour Line“.
  • Click OK and confirm by „All“.
  • Open from the Tables|Obstacles menu the table Contour Lines.

The height points have been converted into five contour lines. The file size has been reduced by this operation by nearly a half.

  • Move the table a little aside and mark some table rows one after the other.

The respective height point cluster will be highlighted.

Import ASCII-File as Height Points

An ASCII file with xyz coordinates of height points can either be imported using the command File|Import, import format „ASCII-Objects“ (see ASCII-Objects), or via the ODBC-interface (see Database Import (ODBC & XLSX)).