Object-scan is one of the most powerful tools of CadnaA. With the selected object type Object-scan sums up any attribute value for all objects of the choosen type. Besides single attribute values even the results of user-defined combinations of attribute values can be used. Therefore you can calculate within your project e.g.

- Length of all roads or railway tracks
- Number of residents living in buildings with less than 10 m height
- Average height of all buildings
- Area of closed polygons (e.g. parking lots, areas of designated land use ...)
- Building heights using height points resulting from overflights
- and a lot more ...

Summing up and displaying the resulting values can be arranged in the following ways:

Single Values:
The evaluation refers to the entire project and the resulting value is displayed on a dialog box.

Specified Areas/Polygons:
First, a target object type is selected whose objects are closed polygons. Furthermore, an attribute of the target object type has to be selected which the summarized values will be assigned to.

Grid and Window Size (side length of a square):
The summation occurs for the existing grid. A scanning window is arranged in a way that its pivot is a grid point. For evaluation and summation the entire grid is run through by shifting the window step by step to the next grid point. The summarized value is addressed to the respective grid point.

Table:
The scanning results are written into a table containing definable classes (for day/night separately). This feature enables - for example - to sum up the residents living in buildings within a specified range of facade levels just by one scanning procedure.

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