SDSS implementation
In building the SDSS, some spatial analyses were carried out and they form the bulk of the GIS fed into the SDSS. The analyses performed included buffer which is one of the most important transformations used in GIS to identify all areas within a certain specific distance of an object (Longley et al., 2001). The buffer operation in the SDSS was carried out to create zones of interest around all identified land use within the university and they were constructed as zonated buffers in which the total distances of the buffer were segmented into rings of regular interval. Though an initial buffer of 50 m interval was planned, a 200 m interval was eventually used. This was because the number of zones created was too much for the high-end processing computer used for this project to handle. The second spatial analysis performed was spatial overlay that combines two or more themes (layers) files, usually in preparation for further analysis. This analysis was carried out to integrate all the different landuse themes alongside their buffers using the overlay by intersection technique. This method of overlay uses the normal intersection in mathematical set theory to integrate the buffer of different landuse.