GIS APPLICATION 

Geographic Information System can be applied in different field which include defence, agriculture, mining, transport, urban planning, census, surveying etc.

Some of the problems of GIS in Nigeria are:

1. Inadequate power
2. Inadequate personnel
3. Inadequate capital
4. Poor communication
5. Low level of technology
6. Lack of GIS institutions.

Data representation

GIS data represents real objects (such as roads, land use, elevation, trees, waterways, etc.).

Real objects can be divided into two abstractions: discrete objects (e.g., a house) and continuous fields (such as rainfall amount, or elevations).

Traditionally, there are two broad methods used to store data in a GIS for both kinds of abstractions.