# GIS and BIM as Integrated Digital Environments for Modeling and Monitoring of Historic Buildings
## 3 Results
### GIS Thematic Mapping  
The integration of the collected multidisciplinary data was performed within a GIS environment. Spatial interrelation was acquired and geospatial attributes were developed thus accomplishing a connection between qualitative and quantitative data. The logical data structure of the GIS platform was developed in such a manner that all the level of information were included, incorporating information from general data down to specific data: building as a whole, facade, parts of the historic building, type of documentation data and spatial features, depicting the recording type of information. The classification of the multidisciplinary data (including building materials, decay, etc.) within the information system was performed via a CAD environment, through a detailed digitization, using orthophotos of each facade as blueprints, while all the qualitative and numeric information were imported in an attribute database. GIS operations are utilized for the documentation of the building materials, as well as for the modelling and analysis of the decay extent and patterns. Relational and Boolean operations were used as well as geoprocessing analysis for the development of thematic maps of the historic building. The thematic maps of the facades of the historic building demonstrate the variation of the building materials and the structural system which alters according to the construction phases, thus providing valuable information related to the masonries and their interconnection on a structural level (Figures 8-11). The thematic maps of the exterior facades, depicting the decay extent related to structural integrity were developed. In addition, the classification of the cracks feature was made, corresponding to three classes, based on the hazard range, capillary, medium range and side to side, while areas where detachment of building material was noticed, are also depicted (Figures 12-15). In Figure 12, the thematic map of the west facade demonstrates the severe deterioration of the walls, presenting cracks that reach the interior of the building and goes side-to-side, while capillary cracks are nearly absent. The area with the highest amount of cracking, is in fact one of the additions on the historic building and more specifically the third one, indicating a deterioration mechanism that affects the structure of the building as a whole. Given the fact that the cracks are located in the upper part of the facade, structural deformations, as well as possible moisture issues, emerge as possible decay factors which could interpret such degradation phenomena. Regarding the location of the cracks in the northwest upper part, information from the architectural drawings of the building, demonstrate that modifications were made and the restroom facilities were located in this area. Since the building was uninhabited for a very long time, plumbing system malfunctions could actively contribute to moisture accumulation and consequently to areas of remaining dampness. The cracks located near the interface of the 2 nd and 3 rd construction phase, can be attributed to incompatibility between the two structures and their building materials. Therefore, the extensive localization of the cracks, can be interpreted by such degradation parameters. In addition, the architectural section (Figure 12), demonstrates the extent of the side-to-side cracks that prevail in the third construction phase (northwest), further indicating its susceptibility to degradation phenomena. In the north facade of the building (Figure 13), excessive amount of building material detachment is concentrated in the area where the third construction phase is located (northwest), while a side to side crack, located above the first floor window of the first construction phase, can be also noticed in the architectural drawing. In addition, detachment of building material located in the lower part of the facade, indicates phenomena of rising damp, nevertheless, severe cracking in the structure of the first construction phase is not noticed.