It has been suggested that the environmental revolution has two aspects. Firstly, it can be seen as man made changes in our natural environment that is both worldwide and sudden; Secondly, it can be regarded as a transformation in human attitude towards the environment (Nicholson, 1970). Rapid growth in the world population, technical innovations and increased industrialization has led to changes in the natural environment at an accelerated pace.
Monitoring the environment, particularly the landscape is very essential for protection and development as well as for acquiring information needed for a meaningful research is based on the study of the past and present conditions and protections to produce the future (Gepung and Jicham, 1989).
Rapport and Reiger (1980) approach to environmental assessment required three major interdependent sets of data.
The classification of the ecological system.
The qualification of those aspects of human activities, vis-à-vis population density, technological advancement etc. which affect or degrades the environment.
Identification of vegetation and agricultural changes which are essential indicators of the ecological status of the study area.
According to Billing (1988), the vegetation and agriculture are more or less a sensitive indicator of environment conditions or it is the first that is noticed in any environmental changes, due to the fact that they are the primary producers of the ecosystem which virtually all organism depends on, and have proven their validity as indicator of environmental conditions through time and space (Billing, 1998).
Rise in world’s population is necessitating expansion in land related activities which in turn brings about some considerable spatial changes with enormous consequences to the environment. Land manager and planners need reliable mechanism to assess these consequences by detecting, monitoring and analysing changes in land condition effectively. Infact, demand for an efficient land cover changes detection system currently exists among a variety of individuals and organizations (Green, et al, 1994).
Changes detection is the process of identifying differences in the state of an objects or phenomenon by observing it at different times. Essentially, this involves the ability to qualify temporal alternations and transformations using multi temporal data sets. Satellite remote sensing systems provide a good opportunity of speedily generating such data-set over a relatively shorter time interval (twice a day for AVHRR, every 18 days for land sat, and every 26 days for spot) then either air photography, radar or ground observation satellite system measure radiance from all object in radiance value called digital numbers (DNs) (Sule, 1990). But the same object can have different DNs if it has undergone a change over time. Satellite systems also generate which is sensitive to a feature, by carefully, selecting a band (or a combination of bands) one can get much as possible excellent information about a feature of his interest.

The possibility of using satellite image for mapping was restricted to research work in GIS and image system (LIS). However, the application of spot imagery into mapping was introduced in 1988. Thus, the effective use of remote sensing data with interpretation techniques. In particular, data processing development and testing of sensors, in studying of materials or properties of surface features, and for the preparation of ground validation.
It is clear however, that the application of remote sensing data to present environmental problems will be achieved by multi-disciplinary specialisation and advices which are to be given by experts in space technology studies (fusel et al, 2000).
Today, various photographic areas, resources assessment and resources management planning, identification, classification, tree species, agricultural crop type, vegetation community, hydrological features and soil type can be appropriately mapped and interpreted through Remote Sensing and GIS technology (omojola,2005).
Knowledge about land use and its changes over time has become increasingly important to overcome the problems of haphazard, uncontrolled development, loss of prime agricultural lands and deteriorating of environmental qualities. Land use data are also needed in the analysis of environmental processes and problems that must be understood if living conditions and standards are to be improved or maintained at current levels.