CIP A 2003 XIX th International Symposium, 30 September-04 October, 2003, Antalya, Turkey 
Figure 4. Example of a data collection form in MS Access* 
filled out for a mosaic 
The combination of GIS spatial analysis and database querying 
(SQL syntax) makes the retrieval of certain objects according to 
various location or attribute criteria, possible. Figure series 5 
show an example of: 
• a topology query at a window of the AutoCAD Map 
environment (5a) 
• the ortho-photomosaic of the eastern façade where the 
structural element of request has to be found (5b) and 
• the result of the search where the queried structural element 
is retrieved and highlighted, in green (5c). 
Thematic maps visualizing different kinds of properties like 
humidity or degradation can also be attained. 
The insertion and update of information can be fully 
accomplished inside the GIS context with the help of context 
with the help of the quite affective interface provided. While 
the database contents are held separately in the external DBMS, 
the connection with the GIS is recoverable at any time, meaning 
that the total storage space which is quite high can be 
affectively reduced. One last issue that has to be stressed is that 
the attribute data stored in the DBMS and the spatial data can 
be modified at any time without affecting the system’s 
functionality. New fields can be specified for the current tables 
and new tables as well. The specification of new spatial entities 
and their interrelation with the necessary attribute data is also 
possible, rendering the system changeable and functional 
according to the user’ needs. These tasks are of great 
importance in the case of a monument under a restoration study. 
The collection of the various pieces of information or the 
correction of the vector drawings, in order to construct their 
topology, are practical matters which are described in detail in 
Karkanis (2001) and lliopoulou (2001). 
Figure 5a. Window with a SQL query based on location criteria 
(output of AutoCAD Map - MS Access) 
Figure 5b. Ortho-photomosaic of the east façade of the church 
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Figure 5c. The result of the query: the queried element of the 
masonry highlighted in green