| Geospatial assessment of vegetation status in Sagbama oilfield environment in the Niger Delta region, Nigeria FU Ochege, RT George, EC Dike, C Okpala-Okaka The Egyptian Journal of Remote Sensing and Space Science 20 (2), 211-221, 2017 | 25 | 2017 |
| Remote sensing of vegetation cover changes in the humid tropical rainforests of Southeastern Nigeria (1984–2014) FU Ochege, C Okpala-Okaka Cogent Geoscience 3 (1), 1307566, 2017 | 24 | 2017 |
| Revision of Nsukka N.E Topographic Map Sheet 287 1:50,000 (1964) Using Nigeria Sat-1 Imageriy C Okpala-Okaka, JI Igbokwe Nigerian Journal of Space Research (NJSR) 7, 2009 | 4 | 2009 |
| Revision of Nigerian Maps: Mapmakers and Their Inputs C Okpala-Okaka | 2* | |
| Management of Flood Disaster Risks in Nigeria Okpala-Okaka C, Onoh Chioma C, Ndukwu R. I, Ebinne E. S Journal of Environmental Management and Safety (JEMS), 2013 | | 2013 |
| Comparison Of Landsat-7 Etm+, And Nigeria Sat-1 Imageries In The Revision Of Nsukka Sheet 287 NE Topographic MapScale 1: 50,000…………… C Okpala-Okaka, JI Igbokwe, R Ndukwu, K Nwosu The Tropical Environment, 2012 | | 2012 |
| Assessment of the Locational Accuracy of Nigeria Sat-1 Imagery Journal of Environmental Resources and Policies 4 (2), 2009 | | 2009 |
| A Comparative Examination of National Spatial Data Infrasructure (NSDI): Nigeria and Some Foreign Initiatives C Okpala-Okaka CAPE: Department of Geography and Meteorology, Nnamdi Azikiwe University …, 2009 | | 2009 |
| Connotations of Urban Thoroughfare Names C Okpala-Okaka Achieving Millenium Goals through Mapping, 2007 | | 2007 |
| Assignment of Urban Thoroughfare Names: A Comparison Between Meanings and Applications C Okpala-Okaka Poster Presentations, 2005 | | 2005 |
| Towards a Culture of Sustained Map Use in Nigeria C Okpala-Okaka Journal of Science and Computer Education, 2001 | | 2001 |
| Map Use Among Nigerians: A Case Study of Some Southern States C Okpala-Okaka Environmental Sciences, 2000 | | 2000 |
| Cartographic Communication as an Effective Medium for Teaching and Acquisition of Knowledge C Okpala-Okaka Method and Media for Effective Instruction, 1998 | | 1998 |
| Changes in Geographical Names: A Case Study of Some Local Government Areas in South-Eastern States, Nigeria (Part 1) C Okpala-Okaka Environmental Review, 1998 | | 1998 |
| Mapping Enugu Environment for Identification of Envirnmental Hazards and Mitigating the Effects of Such Hazards C Okpala-Okaka Management of Environmental Problems in Nigeria, 1998 | | 1998 |
| Tourism Development in Anambra and Enugu States C Okpala-Okaka Cartograohy and Rural Development in Nigeria, Universjty of Uyo, Akwa Ibom, 1994 | | 1994 |
