Collada is an open-standards 3D geometry exchange format based on XML. Currently, it is mainly used in conjunction with KML/KMZ as an embedded container for geo-referenced 3D models. You should consider it a legacy format for all other use cases as it lacks in support for modern materials (e.g. PBR) as well as in import/export support in the major 3d apps. We recommend glTF as an alternative.
Import settings
COLLADA import has a the following options:
File  | Press Browse... to open a file dialog to select an .dae file to import.  | 
Import as static model  | When checked, the file will be imported 'as is' and will not be modifiable by cga rules. Otherwise, Start Shapes will be created from the provided (if available: textured) polygons, ready to be used with CGA rules.  | 
Align to terrain  | When checked, the geometry will be automatically aligned to the terrain.  | 
Scale  | Size factor applied to the imported object.  | 
Offset  | Adds the specified offset to the imported object. 
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