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University of Padua

IMAGE Department

 

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Biogas

 

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GIS

     They are used for inputting, storing, manipulating and outputting information of two kinds:
- geographical elements (location data)
- attributes (statistical or non-location data).
The firsts come mainly from maps, aerial photographs, satellite images, etc. The seconds are directly inputted by the analyst. The information are dismantled into files of homogeneous elements that can be classified and stored in database. Different ways of re-aggregation of these files can then produce outputs suitable for diverse purposes.

 

         GIS are based on the simple idea of overly maps.
Each aspect (set of criteria) can be represented on a singular thematic map, called ‘layer’ or coverage. By superimposing and manipulating many layers (using functions such as ‘summation’, ‘subtraction’ or ‘searching for a pattern’), a new complex thematic map can be generated.

 

Site selection procedure is performed  through overlay maps:

 

Geographic Information System (GIS) are computer facilities which are used to handle data referenced to spatial domain, with the capability to interrelate data sets and to carry out functions to assist their analysis and the presentation of the results.