Full text: XVIIIth Congress (Part B5)

  
  
Figure 1: Part of the palais with some photo positions 
Evaluation of the image material was performed with 
the RolleiMetric MR2 software package. Measure- 
ments were taken on a digitizer in eight times enlarged 
prints. Standard deviation of the image measurement 
was given with 0.015 mm after the bundle adjustment. 
Accuracy of orientation points in the object is 0.01 m. 
Architectural details were taken from a minimum of 
three photos. The measured values like points and 
polylines were converted into Intergraph's Microsta- 
tion. A complete set of two-dimensional facade dra- 
wing were evaluated . 
3D-SURFACE-MODELLING 
Based on 3D photogrammetric measurement results 
and the 2D drawings, produced within Intregraph's 
microstation, a 3D surface model was produced with 
the AutoCAD release 12 drawing editor. 
At the outset a very roughly 3D model was generated 
by using the ground plane and the facade drawings as 
flat walls. From this first model the final complete 3D- 
model was derived with special considerations of layer 
definitions. 
Separation was done according to materials. For 
example a window is separated into glas, wood and 
stone material. Furthermore some special details like 
ornamenmts of the masonry were designed in layers. 
174 
The complete model had a size of 5 Mbytes. By clea- 
ning the drawing from unused references the size of 
the drawing reduced to a useful amount of 3.5 Mbytes. 
For efficient data handling the CAD system enables 
the user to work with external refernces.The content of 
external drawing parts is ownly shown but not loaded 
into the drawing itself. That is different from inserting 
blocks. Moreover changes made in the referenced 
drawings are automatically updated in the current 
drawing. Therefore any drawing including XREF's is 
available in the latest version. 
Referenced Layers, block definititions, line, text and 
dimensions styles are named dependent symbols. Is a 
drawing loaded as an XREF, an access to those 
dependent symbols is impossible. Thus layers only 
existing in the referenced drawing can not declared as 
current layer. One consequently can not draw on such 
layers. However depending symbols can be linked into 
the main drawing for allowing access to them. 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B5. Vienna 1996 
  
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