Abstract: The GIS technology is used in all fields for which the spatial information is relevant, that means in all fields that use the geographical map for stocking, analyzing and representing the data which are processed. No matter what is the field, any GIS application includes a spatial data base (a digital map) and a soft which exploit these data bases. The digital map must contain the spatial data specific to any field whose it is designated to this application. In order to furnish some useful information, this data base must be actual, which means it must represent correctly the terrain (geographic space) that is always under changing. This exploitation soft is made from many functions of analyzing the spatial data contained into the digital map and of visualizing the resulted information, specific to the application field. The most important feature of a GIS consists in its capacity to make spatial analyses, which means to process the spatial data (geographical data) with the purpose to obtain information (reports) regarding the studied area. With this feature of spatial analyze is different the software dedicated to GIS over the software like the CAD. The processing of spatial data is made based on some algorithms specific by using own operations for these such data

Key words: GIS, spatial analysis, 3D, slope, surface, TIN, vector, raster

Presentation: oral