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ACKNOWLEDGEMENT 
All grace through Christ our Lord for the Knowledge and 
Strength to write this paper, May all glory belongs to Him. 
Appreciation goes to Dr Kufoniyi O. for encouraging us to be 
part of the ISPRS. Appreciation also goes to Dr. Yola 
Georgiadou and Dr. Eric de Man for being an inspiration for 
this paper. We are grateful for the support of The International 
Institute for Geo-Information and Earth observation ITC, 
Enshcede, The Netherlands. We are grateful to all our family 
members for their support. Finally we appreciate Nigeria’s 
effort in establishing SDL