Appraisal of Abuja Master Plan Using GIS: A Case Study of Abuja Phase I, Federal Capital Territory, Abuja, Nigeria

The study designed and created a geospatial database for the entities in the study area. The database was subjected to test by issuing single criterion and multiple criteria queries. The single criterion query was issued to test the database on the number of parcels in the study area that are equal to or less than 1500 m2. This is the standard area of a plot when the Abuja Master plan was conceptualized. The query returned 642 parcels out of the 1490 parcels in the study area representing 43.09 percent of the total. The multiple criteria query was issued to show those parcels with more than 25,000 m2 and are developed. The query returned less than 1 percent; that is 11 parcels fall into this category. Buffering was carried out to see the level of compliance of buildings with the 3.0m setback from the fencing walls and the result returned 1725 buildings out of the 3822 buildings within the study area that did not comply with this rule. The parcels were also subjected to a setback of 20m from the river channels in the study area. The rivers were buffered with 20m and overlaid with the parcels. 133 parcels fall within the buffer zone. This is about 8.92 percent of the total parcels in the study area. The implication is that over 90 percent are safe in case there is flooding that spreads around that distance. Graduated colour renderer was used to classify the parcels using the sizes as parameter for the classification.