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4.4 CONTROL PROBLEMS 
Nigeria does not have an adequate control network. Even where some control pillars have 
heen established, many of them get destroyed because of a general lack of awareness on the 
2ortance of survey marks by the generality of the populace. Consequently a lot of time and 
"24ey Is spent in providing ground control in any photogrammetric project. 
4.5 DATA PROCESSING 
Electronic computers are available in many large cities in Nigeria today. Software for photo 
grammetric adjustment are also available. However, computer services still present a major prob- 
lem for the Photogrammetrist. Frequent power cuts often result in frequent computer break- 
downs. In addition, adequate manpower for computer maintainance is not available. There is also 
the-problem of unavailability of spare parts. 
4.6 ABSENCE OF PHOTOGRAMMETRIC RESEARCH 
Photogrammetric research is not encouraged by either the government or the private sector. 
The result is that there is a complete stagnation of the Nigeria Photogrammetrist. It becomes 
almost impossible to improve on old photogrammetric techniques or to develop new ideas. 
5.0 NON-TOPOGRAPHIC APPLICATIONS 
In tracing the history of Photogrammetry in Nigeria it is ubserved that the possible non-topo- 
graphic applications of Photogrammetry are yet to be employed in this country. Ayeni (1985) 
highlighted the various possible applications of close-range photogrammetry in Biosteremetrics, 
Traffic Accident investigations, Architectural and Museum Studies and so on. 
6.0 FUTURE PROSPECTS 
In the last two decades photogrammetry has been the basic metric tool for the production 
of topographical maps in Nigeria. Mapping of the country is not yet complete. Besides the 
1/50,000 series, maps at large scales such as 1/25,000, 1/10,000, 1/2,500 and so on will become 
necessary as national development advances. Photogrammetry will therefore continue to feature 
prominently as a topographical mapping tool. Furthermore, photogrammetry will gradually 
replace some survey operations that are currently done by traditional ground survey methods. 
Ogbechie and Olaleye (1986) suggested the use of photogrammetry in oil field surveys for well 
fixing, lease surveys, deformation measurements and general monitoring of structures around oil 
field locations. 
Photogrammetry will also play a very important role in the establishment of Land Informa- 
tion Systems in Nigeria. For an effective land inventory and land administration, Nigeria will have 
to develop a reliable data bank where all information about land can be stored and retrieved 
quickly when needed. The State Governments will need such computerised Information Systems 
in order to implement the Land Use Decree. The present bottle-neck in the issuance of certifi- 
cates of occupancy can then be eliminated. 
Finally, it is observed that satellite imagery will gradually replace conventional photogramme- 
try in the coming decades. Presently satellite imagery is being used for thematic mapping and 
offshore positioning of oil wells among other things. The resolution of satellite imagery will get 
better in the years to come. Even with the present 5— 10m resolution available today, satellite 
imagery will surely become an important complement for conventional photogrammetry.